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科目: 來(lái)源: 題型:閱讀理解

Monkeys prefer heavy metal to classical music, according to researchers at the University of Wisconsin whose findings are published this week in Biology Letters.
Scientists played a selection of music to a group of South American cotton-top monkeys but the only sound that got a reaction were from the heavy metal band Metallica. They were seemingly disinterested in Led Zeppelin, Miles Davis and Bach, but after the beautiful sound of Master of Puppets by Metallica was played the monkeys calmed down.
"Monkeys interpret rising and falling sounds differently than humans. Oddly, their only response to several samples of human music was a calming response to the heavy-metal band Metallica," said Professor Charles Snowdon, from the University of Wisconsin-Madison.
Rather than making them excited or aggressive, the heavy metal tracks had a comforting effect. Dr Snowdon, who teamed up with National Symphony Orchestra musican David Teie, also played the monkeys music composed specifically for them. Although they enjoyed Metallica, they were much more interested in these pieces.
A melody(樂(lè)曲) based on the short calls of scared monkeys led to anxiety levels rapidly growing, researchers found, while one based on long calls the creatures make when they are happy had a calming effect.
Frans B.M. de Waal, a professor of psychology at Emory University who studies animals, said the findings appear to say more about how monkeys respond to the sounds they make than they do about music or the evolution of music.
Dr Snowdon no longer has a monkey colony to use in his research, but he said his co-author David Teie is exploring the concept of music for cats.
"If we understand how we can affect their emotional states through using musical sound and aspects of our speech, maybe those of us living with companion animals can have a better relationship with them, too," Snowdon said.
【小題1】The research mentioned in the passage is mainly about ______.

A.the change of music over timeB.a(chǎn)nimals’ response to music
C.special music for animalsD.the origin of music
【小題2】When the monkeys heard the music they liked, they ______.
A.looked anxiousB.became restless
C.felt at easeD.made long calls
【小題3】According to the passage, the monkeys are most interested in the music ______.
A.of Led ZeppelinB.of Miles Davis
C.of MetallicaD.specially composed for them
【小題4】The aim of the research, according to Professor Snowdon, is to ______.
A.build better ties between animals and humans
B.compare monkeys and cats in term of music
C.develop new music based on animals’ calls
D.find better ways to keep animals under control

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科目: 來(lái)源: 題型:閱讀理解

Not long ago, people thought babies were not able to learn things until they were five or six months old. Yet doctors in the United States say babies begin learning on their first day of life.
Scientists note that babies are strongly influenced by their environment. They say a baby will smile if her mother does something the baby likes. A baby learns to get the best care possible by smiling to please her mother or other caregiver. This is how babies learn to connect and communicate with other human beings.
One study shows that babies can learn before they are born. The researchers placed a tape recorder on the stomach of a pregnant woman. Then, they played a recording of a short story.  On the day the baby was born, the researchers attempted to find if he knew the sounds of the story repeated while in his mother. They did this by placing a device in the mouth of the newborn baby. The baby would hear the story if he moved his mouth one way. If the baby moved his mouth the other way, he would hear a different story. The researchers say the baby clearly liked the story he heard before he was born. They say the baby would move his mouth so he could hear the story again and again.
Another study shows how mothers can strongly influence social development and language skills in their children. Researchers studied the children from the age of one month to three years. The researchers attempted to measure the sensitivity of the mothers. The women were considered sensitive if they supported their children’s activities and did not interfere unnecessarily. They tested the children for thinking and language development when they were three years old. Also, the researchers observed the women for signs of depression.
The children of depressed women did not do as well in tests as the children of women who did not suffer from depression. The children of depressed women did poorly in tests of language skills and understanding what they hear.
These children also were less cooperative and had more problems dealing with other people. The researchers noted that the sensitivity of the mothers was important to the intelligence development of their children. Children did better when their mothers were caring, even when they suffered from depression.
【小題1】According to the passage, which of the following is NOT the factor that influences intelligence development in babies?

A.The environment.B.Mother’s sensitivity.
C.Their peers (同齡人)D.Education before birth.
【小題2】What is the purpose of the experiment in which newborn babies heard the stories?
A.To prove that babies can learn before they are born.
B.To prove that babies can learn on the first day they are born.
C.To show mothers can strongly influence intelligence development in their babies.
D.To indicate early education has a deep effect on the babies’ language skills.
【小題3】Which group of children did the worst in tests of language skills?
A.The children of depressed mothers who cared little for their children.
B.The children of women who did not suffer from depression.
C.The children of depressed but caring mothers.
D.Children with high communication abilities.
【小題4】What is the main idea of the passage?
A.Scientific findings about how babies develop before birth.
B.Scientific findings about how the environment has an effect on babies’ intelligence.
C.A study shows babies are not able to learn things until they are rice or six months old.
D.Scientific findings about how intelligence develops in babies.

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科目: 來(lái)源: 題型:閱讀理解

Everyone has got two personalities-the one that is shown to the world and the other that is secret and real. You don’t show your secret personality when you’re awake because you can control your behavior, but when you’re asleep, your sleeping position shows the real you. In a normal night, of course, people frequently change their positions. The important position is the one that you go to sleep in.
If you go to sleep on your back, you’re a very open person. You normally trust people and you are easily influenced by fashion or new ideas. You don’t like to displease people. So you never express your real feelings. You’re quite shy and you aren’t quite sure of yourself.
If you sleep on your stomach, you are a rather secretive person. You worry a lot and you’re always easily upset. You always stick to your own opinions or judgment, but you don’t raise your hopes too much. You usually live for today not tomorrow. This means that you enjoy having a good time.
If you sleep curled up, you are probably a very nervous person. You have a low opinion of yourself and so you’re often defensive. You’re shy and you don’t normally like meeting people. You prefer to be on your own. You’re easily hurt.
If you sleep on your side, you have usually got a well—balanced personality. You know your strengths and weakness. You’re usually careful. You believe in yourself. You sometimes feel anxious, but you don’t often get sad. You always insist on what you think even if it makes people rather angry.
【小題1】According to the passage, a person, who is not willing to change his mind and hard to deal with, probably sleeps           .

A.on his sideB.on his backC.curled upD.on his stomach
【小題2】If a person prefers to sleep curled up rather than on his back, he may be well content to    .
A.do things personally.B.stay alone
C.keep things secretD.trust others easily
【小題3】Which of the following people, in the author’s opinion, most likely have personalities opposite to each other ?
A.The people sleeping on their stomachs and those sleeping on his backs.
B.The people sleeping on their sides and those sleeping curled up.
C.The people sleeping on their backs and those sleeping on their sides.
D.The people sleeping curled up and those sleeping on their stomach.
【小題4】What the author mainly intends to tell us is that            .
A.one’s sleeping position has something to do with one’s character.
B.everyone has got both real and secret personalities.
C.the position in which one goes to sleep is the most important one.
D.when awake, one does not show one’s secret personality.

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科目: 來(lái)源: 題型:閱讀理解

In films, dads change from cruel men to loving souls. Here is a list of good and bad movies dads .Atticus Finch in To kill a Mockingbird(殺死一只知更鳥(niǎo))
GOOD DAD:A man whose wife has died with a young family and a busy job as a lawyer, Gregory Peck's character in the  1962 film is one of the great heroes of American cinema  Firm but fair he teaches his children respect and human decency(正派).Harper Lee's novel gets a respectable transposition(轉(zhuǎn)變)to film, thanks to Gregory Peck's perfect performance.
Jack Torrance in The Shining
BAD DAD: When Jack Torrance ,his wife ,Wendy ,and son, Danny ,escaped from the cold winter to  the Overlook Hotel  we know that Jack has hardly been a model father But when Jack becomes extremely angry and tries to murder his family with an axe, Danny used his intelligence to defeat him and left him to  freeze to death.
George Bailey in It's a Wonderful life
GOOD DAD: James Stewart's character is a father-of-four who is saved from the edge of suicide (自殺)and realizes his positive effect on others lives.Much of the film is unpleasant, with George shouting at his children as he faces financial problems.  But finally the lovable father realizes the worth of his own life, the value of friendship and the importance of being a loving dad
Darth Vader in The Empire Strikes Back(帝國(guó)大廈)
BAD DAD: When the unfriendly cyborg(半機(jī)器人)told Luke Skywalker that he was his father ,the son's reaction says it all: "No! No!" It's hardly a joyful welcome to the family.  For most of his son's life, Darth Vader has been an absent dad—and he has just cut off Luke's hand You can understand why Father's Day cards might not be available.
【小題1】Who is Harper Lee?

A. An actor.B. A novelistC. A movie director.D. A translator.
【小題2】According  to the text, ______died of freezing cold
A. Jack TorranceB. WendyC. DannyD. Darth Vader
【小題3】Which movie should you watch if you want to see a helpless father change?
A.To kill a MockingbirdB.The Shining
C.It's a Wonderful LiftD.The Empire Strikes Book
【小題4】What happened to Luke?
A.He lost his hand in an accident
B.His father changed him into a cyborg.
C.He discovered that he had a cruel father:
D.His father lived with him for most of his life.

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科目: 來(lái)源: 題型:閱讀理解



It doesn’t kill germs better than cooler water, but turning tap temperatures high, the US burns carbon equal to the emissions of Barbados.
People typically wash their hands seven times a day in the United States, but they do it at a far higher temperature than is necessary to kill germs, a new study says. The energy waste is equivalent to the fuel use of a small country.
It’s cold and flu season, when many people are concerned about avoiding germs. But forget what you think you know about hand washing, say researchers at Vanderbilt University. Chances are good that how you clean up is not helping you stay healthy; it is helping to make the planet sick.
Amanda R. Carrico, a research assistant professor at the Vanderbilt Institute for Energy and Environment in Tennessee, told National Geographic that hand washing is often “a case where people act in ways that they think are in their best interest, but they in fact have inaccurate beliefs or outdated perceptions.”
Carrico said, “It’s certainly true that heat kills bacteria, but if you were going to use hot water to kill them it would have to be way too hot for you to tolerate.”
She explained that boiling water, 212°F (99.98°C), is sometimes used to kill germs - for example, to clean drinking water that might be polluted with germs. But “hot” water for hand washing is generally within 104°F to 131°F (40°C to 55°C.) At the high end of that range, heat could kill some germs, but the sustained contact that would be required would scald the skin.
Carrico said that after a review of the scientific literature, her team found “no evidence that using hot water that a person could stand would have any benefit in killing bacteria.” Even water as cold as 40°F (4.4°C) appeared to reduce bacteria as well as hotter water, if hands were scrubbed, rinsed(沖洗)and dried properly.
In fact, she noted that hot water can often have an unfavorable effect on hygiene. “Warmer water can harm the skin and affect the protective layer on the outside, which can cause it to be less resistant to bacteria,” said Carrico.
Using hot water to wash hands is therefore unnecessary, as well as wasteful, Carrico said, particularly when it comes to the environment. According to her research, people use warm or hot water 64 percent of the time when they wash their hands. Using that number, Carrico’s team calculated a significant impact on the planet. 
“Although the choice of water temperature during a single hand wash may appear minor, when multiplied by the nearly 800 billion hand washes performed by Americans each year, this practice results in more than 6 million metric tons of CO2 equivalent emissions annually,” she said.
That’s roughly equal to the emissions of two coal-fired power plants, or 1,250,000 passenger vehicles, over the course of a year. It’s higher than the greenhouse gas emissions of small countries like El Salvador or Armenia, and is about equivalent to the emissions of Barbados. If all US citizens washed their hands in cooler water, it would be like eliminating the energy-related carbon emissions of 299,700 US homes, or the total annual emissions from the US zinc or lead industries. 
The researchers found that close to 70 percent of respondents said they believe that using hot water is more effective than warm, room temperature, or cold water, despite a lack of evidence backing that up, said Carrico. Her study noted research that showed a “strong cognitive(認(rèn)知的) connection” between water temperature and hygiene in both the United States and Western Europe, compared to other countries, like Japan, where hot water is associated more with comfort than with health.
The researchers published their results in the July 2013 issue of International Journal of Consumer Studies. They recommended washing with water that is at a “comfortable” temperature, which they noted may be warmer in cold months and cooler in hot ones.
【小題1】What does the writer mainly focus on when writing this passage?

A.Whether hot water helps kill germs effectively in hand washing.
B.How hot water contributes to the serious worsening of our planet.
C.Why the consumption of hot water is unnecessary and wasteful.
D.What the advantages and disadvantages of using hot water are.
【小題2】The underlined word scald in paragraph six probably means         .
A.burnB.improveC.softenD.wrinkle
【小題3】According to the passage, all the following share roughly the same CO2 emissions yearly EXCEPT         .
A.two coal-fired power plantsB.US zinc or lead industries
C.1,250,000 passenger vehiclesD.El Salvador or Armenia
【小題4】Which of the following is WRONG according to the passage?
A. Boiling water at 212°F (99.98°C) works effectively in killing germs.
B. Warmer water can damage the protective layer of the outside skin.
C. There is much difference between cold water and hot water in reducing bacteria.
D. Americans have inaccurate beliefs or outdated perceptions in hand washing.
【小題5】Which of the following is the standard of a comfortable water temperature for washing hands?
A. Warmer in winter and cooler in summer.    
B. Between 104°F to 131°F (40°C to 55°C).
C. Below 104°F (40°C) or above 131°F (55°C).  
D. Warm enough to kill germs and clean up.
【小題6】 If you want to read stories of this kind afterwards, which of the following magazines will you probably subscribe to?
A.Universal Science Fiction B.Science & Discoveries
C.Environment & Protection D.Exploration of America

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科目: 來(lái)源: 題型:閱讀理解



At the moment, there are two reliable ways to make electricity from sunlight. You can use a panel of solar cells to create the current directly, by liberating electrons from a semiconducting material such as silicon. Or you can concentrate the sun’s rays using mirrors, boil water with them, and employ the steam to drive a generator.
Both work. But both are expensive. Gang Chen of the Massachusetts Institute of Technology and Zhifeng Ren of Boston College therefore propose an alternative. They suggest that a phenomenon called the thermoelectric(熱電)effect might be used instead—and they have built a prototype(原型)to show that the idea is practical.
Thermoelectric devices are not new. They are used, for example, to capture waste heat from car engines. They work because certain materials generate an electrical potential difference within themselves if one part is hotter than another. That can be used to drive a current through an external circuit.
The reason thermoelectric materials have not, in the past, been applied successfully to the question of solar power is that to get a worthwhile current you have to have a significant temperature difference. (200℃ is considered a good starting point.) In a car engine, that is easy. For sunlight, however, it means concentrating the heat in some way. And if you are going to the trouble of building mirrors to do that, you might as well go down the steam-generation route, which is a much more efficient way of producing electricity. If the heat concentration could be done without all the equipment of mirrors, though, thermoelectricity’s inefficiency would be balanced by the cheapness of the equipment.
In their view, three things are needed to create a workable solar-thermoelectric device. The first is to make sure that most of the sunlight which falls on it is absorbed, rather than being reflected. The second is to choose a thermoelectric material which conducts heat badly but electricity well. The third is to be certain that the temperature gradient(梯度)which that badly conducting material creates is not wasted by poor design.
【小題1】The following methods can be adopted to make electricity from sunlight EXCEPT         .

A.putting a panel of solar cells into use
B.concentrating sun’s rays with mirrors
C.creating a solar-thermoelectric device
D.building a practical solar prototype
【小題2】Why was the application of thermoelectric materials a failure in the past?
A.Because it’s hard for them to build enough mirrors to make it work.
B.Because 200℃ was hard to reach at that time even in a car engine.
C.Because of the failure of having a significant temperature difference.
D.Because it was hard to focus the sun’s rays with equipment of mirrors.
【小題3】Which of the following is the best title for this passage?
A.Thermoelectric Device --- the Best Method of All
B.A New Method of Making Electricity from Sunlight
C.How to Create a Workable Thermoelectric Device
D.Solar Power --- a New Energy Trend in the Future

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科目: 來(lái)源: 題型:閱讀理解

Every electronic gadget (小玩意) needs good memory. A music player stores songs, albums and playlists. A computer holds schoolwork and programs and remembers how far a player has advanced in his or her favorite game. Mobile phones store names, numbers and hundreds of texts.
Now, scientists in California say they have come up with a way to turn a living cell into a memory device.
It can store only one tiny bit of information, but it’s a start. In the future, a cell-based gadget might travel through the body and record measurements. The benefit to human health could be big: the right tool, for example, might record the earliest signs of disease.
Doctors, scientists and other curious people want to know what is happening inside the body, even at levels that can’t be seen by the naked eye. So far, there is no device small enough to travel through the bloodstream.
If normal machines won’t do the trick, perhaps biology will. Scientists who work in the field of synthetic (合成的) biology are trying to find ways to turn living things into human tools. In the case of the new memory device, bioengineers from Stanford University used the genetic material inside living cells to record information.
This genetic material consists of DNA. Found in nearly every cell, DNA carries all of the information that keeps a living thing alive.
In the new experiment, the researchers turned DNA from bacteria(細(xì)菌) into a switch. They “flip (翻轉(zhuǎn))” a small section of DNA. Then, using the same procedure (過(guò)程) , the scientists flip the section again—returning it into its normal structure.
Using these DNA switches, “We can write and erase DNA in a living cell,” bioengineer, Jerome Bonnet, explained to Science News.
It might take years before his team or others identity whether a DNA-based memory device might be practical. Right now, it takes one hour to complete a flip. That is far too long to be useful. Plus, a flipped section has a very small little memory—less than what a computer uses to remember a single letter.
“This was an important proof that it was doable,” Bonnet told Science News. “Now we want to build a more complex system, something that other people can use.”
【小題1】What is the aim of listing the electronic things in the first paragraph?

A.To make the passage more fashionable.
B.To show how electronic things have memory.
C.To discuss things in detail.
D.To make the subject of the text more understandable.
【小題2】What is possible future benefit of the cell-based gadget for people?
A.To detect disease at the earliest point.
B.To help improve the memory.
C.To help people build a body.
D.To replace many electronic gadgets.
【小題3】What is the object being researched?
A. The cells of bacteria.         
B. The DNA of bacteria.
C. A section of bacteria.         
C. The nucleus of bacteria.
【小題4】What do we know about a flipped section of DNA?
A.It has a very small memory.
B.It can function as a computer.
C.It has one letter in it.
D.It takes a day to complete it.

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科目: 來(lái)源: 題型:閱讀理解

About ten men in every hundred suffer from color blindness in some way. Women are luckier, only about one in two hundred if affected in this matter. Perhaps, after all, it is safer to be driven by a woman.
There are different forms of color blindness. In some cases a man may not be able to see deep red. He may think that red, orange and yellow are all shades of green. Sometimes a person can’t tell the differences between blue and green. In rare cases an unlucky man sees everything in shades of green--- a strange world in deed.
Color blindness in human beings is a strange thing to explain. In a single eye there are millions very small things called “cones”. These help us see in a bright day and tell the differences between colors. There are also millions of “rods”, but these are used for seeing when it is nearly dark. They show us shapes(形狀) but not color. Some insects have favorite colors. Mosquitoes like blue but do not like yellow. A red light will not attract insects but a blue lamp will. In similar way human being also have favorite colors. Yet we are lucky. With the aid of cones in our eyes we can see many beautiful colors by day and with the aid of the rods we can see shapes at night. One day we may even learn more about the invisible colors around us.
【小題1】The passage is mainly about ______.

A.color and its surprising effects on drivers 
B.women being luckier than man in that fewer of them are color blind 
C.danger caused by color blindness 
D.color blindness and how our eyes tell different colors and shapes 
【小題2】According to the passage, with the help of “cones” we can _____.
A.tell different colors B.see in weak light 
C.tell different shapes D.tell orange from yellow 
【小題3】Why do some people say it is safer to be driven by women?
A.Women are more careful. 
B.There are fewer color blind women. 
C.Women are fonder of driving than men. 
D.Women are weaker but quicker in thinking. 
【小題4】Which of the following statements about color blind people is true?
A.Not all of them have the same problem in recognizing colors.  
B.None of them can see deep red but all can tell blue from green. 
C.None of them can tell blue from green but all can see deep red.  
D.All of them are lucky enough to see everything in shades of green. 

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科目: 來(lái)源: 題型:閱讀理解

There is some unwelcome news for students preparing for exams and officers putting in long hours-----you don't need the break as much as you may think that makes you feel less tired.
Scientists have long assumed that willpower (意志力) is a limited resource, which is why you feel the need to have a rest, have a snack and come back to a task when you're feeling better. They argued that the only way to restore willpower was by rest, food or entertainment.
But psychologists have challenged this theory, saying weak willpower is all in your head. They found that people's beliefs in willpower determine how long and how well they'll be able to work on a tough mental exercise. "If you think of willpower as something that's limited, you're more likely to be tired when you perform a difficult task," said Prof.Veronika Job. "'But if you think of willpower as something that is not easily used up, you can go on and on."
The researchers designed four experiments to test students'-beliefs in willpower. After a tiring task, those, who believed or were led to believe that willpower is a limited resource, performed worse on standard concentration tests than those who thought of willpower as something they had more control over. They also found that leading up to final exam week, students who believed the limited resource theory ate junk food 24 percent more often than those who believed they had more control in resisting temptation (誘惑).
Mr. Job said. "The theory that willpower is a limited resource is interesting, but it has had unintended consequences. Students who may already have trouble studying are being told that their power of concentration is limited, and they need to take frequent breaks. But a belief in willpower as a non-limited resource makes people stronger in their ability to work through challenges.'"
The findings could help people who are" battling temptation. Willpower isn't driven by a biologically based process as much as we used to think. The belief in it is what influences your behavior.
【小題1】The theory that willpower is limited supports that _________.

A.people must eat snacks when they feel tired
B.people do need a break to restore their willpower
C.there’s no way to strengthen people’s willpower
D.weak willpower doesn’t affect people’s life much
【小題2】What have the scientists long believed regarding willpower?
A.It is in the charge of people.
B.It is a limited resource.
C.There is no way to restore willpower.
D.It doesn’t easily run out.
【小題3】Which of the following best helps the students to prepare better for their exams?
A.Push themselves even if they want to take a break.
B.Don’t eat fast food while studying.
C.Remind themselves willpower is not limited.
D.Stay in a comfortable and quiet place.
【小題4】The following groups can benefit from the findings except
A.patients following strict diets
B.children liking to watch TV
C.smokers trying to give up smoking
D.employees facing a new but well-paid task
【小題5】What’s the best title for the passage?
A.A new theory about willpower B.How to build strong willpower
C.The great influence of willpower D.Willpower doesn’t last long

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科目: 來(lái)源: 題型:閱讀理解

Animals are considered to be endangered if the species is close to extinction throughout all or most of its environment. Animals become endangered for a variety of reasons.
Some animals become endangered when their habitats contain resources for humans. For example, commercial forest cutting in the Amazon Rainforest has seriously reduced the population of many animal species and lead to the extinction of other groups. Land itself is an important resource to humans since it provides us with living space, and when people replace animal habitats with human habitats, it can lead to larger loss of natural species.
Commercial and industrial operations may reduce land or water for animals and pollute their environment. Due to water pollution, the baiji, a fresh water dolphin native to China, was declared extinct, meaning it’s unlikely the population can recover. Even noise pollution from human activities can lead to the disorder of animal behavior.
Another cause that makes animals become endangered is over-fishing or over-hunting. Over-hunting whales led to near extinction of many species of whales.
The introduction of a non-native species to a habitat may make animals become endangered. The native species may not defend against a new one, and the effects can be dangerous. In Australia, the introduction of the common house cat led to the extinction of the red-fronted parakeet and has seriously damaged the populations of several small animals.
Introduced species can also bring new diseases with them. As a result, animals become endangered. Native animals may not have the power to fight against non-native diseases, and population levels can suffer. Another cause of disease is human-introduced chemicals. The use of DDT is believed to be one of the leading causes in driving the California Condor to near extinction.
When animals become endangered, the entire food chain can be affected. For example, in 2008 disease seriously harmed the honeybee, which is largely responsible for pollinating(授花粉)  plants, including many fruits and vegetables. Without their pollination, a very large part of the human diet could be reduced. In fact, if the honeybee should become extinct, our life would be affected and billions of dollars would be lost. Therefore, many people argue that when animals become endangered it is in man’s own self-interest to protect them.
【小題1】The passage is mainly about ______.

A.ways of protecting animals’ habitats
B.effects caused by species endangerment
C.dangers of bringing in non-native species
D.reasons why animals become endangered
【小題2】Which of the following examples shows that environmental pollution may cause species endangerment?
A.The extinction of the whales.
B.The extinction of the red-fronted parakeet.
C.The decreasing population of the dolphin.
D.The effect of the honeybee on the human diet.
【小題3】Why is it dangerous to introduce a non-native species to a habitat?
A.Native species are likely to die from the new diseases.
B.It’s hard for non-native species to survive.
C.Non-native species will take up more space.
D.Native species are so powerful for non-native species.
【小題4】The California Condor is in danger of dying out because of ______.
A.loss of habitat B.harmful chemicals
C.forest cutting D.unfamiliar diseases
【小題5】We can infer from the last paragraph that ______.
A.humans are to blame for species extinction
B.small animals mean little to the whole food chain
C.protection of the honeybee has cost billions of dollars
D.humans protect animals for the benefit of themselves

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