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He was careless: Such mistakes       .

       A．could be avoided                                  B．could avoid

       C．could have avoided                              D．could have been avioded

He was careless and made many spelling mistakes in his composition．But such mistakes____．

A．could have been avoided                            B．could avoid

C．could have avoided                                  D．could be avoided

　　Today, air travel is far safer than driving a car on a busy motor-way．But still there is a danger that grows every year．Airliners get larger and larger．Some airplanes can carry over 300 passengers．And the air itself becomes more and more crowded．If one large airliner struck into another in midair, 600 lives could be lost．

　　From the moment an airliner takes off to the moment it lands, every movement is watched on radar screens．Air traffic controllers tell the pilot exactly when to turn, when to climb, and when to come down．The air traffic controllers around a busy airport like London-Heathrow may deal with 2,500 planes a day．Not all of them actually land at the airport．Any plane that flies near the airport comes under the orders of the controllers there．Even a small mistake on their part could cause a terrible accident．

　　Recently such a disaster almost happened．Two large jets were flying towards the airport．One was carrying 69 passengers from Toronto, the other 176 passengers from Chicago．An air traffic controller noticed on his radar screen that the two planes were too close to each other．He ordered one to turn to the right and to climb．But he made a mistake．He ordered the wrong plane to do this．So, instead of turning away from the second plane, the first plane turned towards it．Fifteen seconds later it flew directly in front of the second plane．They avoided each other by the smallest part of a second．The distance between them was less than that of a large swimming pool．This is an example of the danger that grows every year．

1．Which of the following is TRUE according to the passage?

[　　]

A．Traveling by air is as safe as by car．

B．Traveling by air is not as safe as by car．

C．Traveling by car is as dangerous as by air．

D．Traveling by car is more dangerous than by air．

2．The air traffic controllers of an airport________．

[　　]

A．control all the planes flying near the airport

B．give orders to planes leaving the airport

C．only deal with the planes that want to land there

D．a(chǎn)re allowed to handle 250 planes a day

3．The danger of air crashes grows every year because ________．

[　　]

A．a(chǎn)irliners are getting larger and air traffic is becoming heavier

B．a(chǎn) pilot does not always hear a controller's order

C．a(chǎn) controller is likely to make more and more mistakes

D．a(chǎn)irports can hardly serve the growing number of airplanes

4．The example in the passage is to show that ________．

[　　]

A．a(chǎn)ir traffic controllers are often careless

B．a(chǎn)ir traffic controllers should pay much attention to avoiding accidents

C．it is difficult for airplanes to avoid terrible accidents

D．two planes should not fly too close to each other

Today, air travel is far safer than driving a car on a busy motorway. But still there is a danger that grows every year. Airliners get larger and larger. Some airplanes can carry over 300 passengers. And the air itself becomes more and more crowded. If one large airliner struck into another in mid-air, 600 lives could be lost.

From the moment an airliner takes off to the moment it lands, every movement is watched on radar screens. Air traffic controllers tell the pilot exactly when to turn, when to climb, and when to come down. The air traffic controllers around a busy airport like London-Heathrow may deal with 2,500 planes a day. Not all of them actually land at the airport.  Any plane that flies near the airport comes under the orders of the controllers there. Even a small mistake on their part could cause a terrible accident.

    Recently such a disaster almost happened. Two large jets were flying towards the airport. One was carrying 69 passengers from Toronto, the other 176 passengers from Chicago. An air traffic controller noticed on his radar screen that the two planes were too close to each other. He ordered one to turn to the right and to climb. But he made a mistake. He ordered the wrong plane to do this. So, instead of turning away from the second plane, the first plane turned towards it. Fifteen seconds later it flew directly in front of the second plane. They avoided each other by the smallest part of a second. The distance between them was less than that of a large swimming pool. This is an example of the danger that grows every year.

1. The air traffic controllers of an airport             .

A．control all the planes flying near the airport

B．give orders to planes leaving the airport

C．only deal with the planes that want to land there

D．a(chǎn)re ordered to handle 2500 planes a day in England

2. The danger of air crashes grows every year because             .

A．a(chǎn)irliners are getting larger and air traffic is becoming heavier

B．a(chǎn) pilot does not always hear a controller’s order

C．a(chǎn) controller is likely to make more and more mistakes

D．a(chǎn)irports can hardly serve the growing number of airplanes

3. The example in the passage is to show that                 .

A．a(chǎn)ir traffic controllers are often careless

B．a(chǎn)ir traffic controllers should pay much attention to avoiding accidents

C．it is difficult for airplanes to avoid terrible accidents

D．two planes should not fly too close to each other

閱讀理解

　　Today, air travel is far safer than driving a car on a busy motor-way. But still there is a danger that grows every year. Airliners get larger and larger. Some airplanes can carry over 300 passengers. And the air itself becomes more and more crowded. If one large airliner struck into another in midair, 600 lives could be lost.

　　From the moment an airliner takes off to the moment it lands, every movement is watched on radar screens. Air traffic controllers tell the pilot exactly when to turn, when to climb, and when to come down. The air traffic controllers around a busy airport like London Heathrow may deal with 2 500 planes a day. Not all of them actually land at the airport. Any plane that flies near the airport comes under the orders of the controllers there. Even a small mistake on their part could cause a terrible accident.

　　Recently such a disaster almost happened. Two large jets were flying towards the airport. One was carrying 69 passengers from Toronto, the other 176 passengers from Chicago. An air traffic controller noticed on his radar screen that the two planes were too close to each other. He ordered one to turn to the right and to climb. But he made a mistake. He ordered the wrong plane to do this. So, instead of turning away from the second plane, the first plane turned towards it. Fifteen seconds later it flew directly in front of the second plane. They avoided (避免) each other by the smallest part of a second. The distance between them was less than that of a large swimming pool. This is an example of the danger that grows every year.

1．Which of the following is true according to the passage?

[　　]

A．Traveling by air is as safe as by car.

B．Traveling by air is not as safe as by car.

C．Traveling by car is as dangerous as by air.

D．Traveling by car is more dangerous than by air.

2．The air traffic controllers of an airport ______.

[　　]

A．control all the planes flying near the airport

B．give orders to planes leaving the airport

C．only deal with the planes that want to land there

D．a(chǎn)re allowed to handle 250 planes a day

3．The danger of air crashes grows every year because ______.

[　　]

A．a(chǎn)irliners are getting larger and air traffic is becoming heavier

B．a(chǎn) pilot does not always hear a controller's order

C．a(chǎn) controller is likely to make more and more mistakes

D．a(chǎn)irports can hardly serve the growing number of airplanes

4．The example in the passage is to show that ______

[　　]

A．a(chǎn)ir traffic controllers are often careless

B．a(chǎn)ir traffic controllers should pay much attention to avoiding accidents

C．it is difficult for airplanes to avoid terrible accidents

D．two planes should not fly too close to each other

閱讀理解

　　Today, air travel is far safer than driving a car on a busy motor-way. But still there is a danger that grows every year. Airliners get larger and larger. Some airplanes can carry over 300 passengers. And the air itself becomes more and more crowded. If one large airliner struck into another in mid air, 600 lives could be lost.

　　From the moment an airliner takes off to the moment it lands, every movement is watched on radar screens. Air traffic controllers tell the pilot exactly when to turn, when to climb, and when to come down. The air traffic controllers around a busy airport like London-Heathrow may deal with 2500 planes a day. Not all of them actually land at the airport. Any plane that flies near the airport comes under the orders of the controllers there. Even a small mistake on their part could cause a terrible accident.

　　Recently such a disaster almost happened. Two large jets were flying towards the airport. One was carrying 69 passengers from Toronto, the other 176 passengers from Chicago. An air traffic controller noticed on his radar screen that the two planes were too close to each other. He ordered one to turn to the right and to climb. But he made a mistake. He ordered the wrong plane to do this. So, instead of turning away from the second plane, the first plane turned towards it. Fifteen seconds later it flew directly in front of the second plane. They avoided (避免) each other by the smallest part of a second. The distance between them was less than that of a large swimming pool. This is an example of the danger that grows every year.

1．Which of the following is true according to the passage?

[　　]

A．Traveling by air is as safe as by car.

B．Traveling by air is not as safe as by car.

C．Traveling by car is as dangerous as by air.

D．Traveling by car is more dangerous than by air.

2．The air traffic controllers of an airport ________.

[　　]

A．control all the planes flying near the airport

B．give orders to planes

C．only deal with the planes that want to land there

D．a(chǎn)re allowed to handle 250 planes a day

3．The danger of air crashes grows every year because ________.

[　　]

A．a(chǎn)irliners are getting larger and air traffic is becoming heavier

B．a(chǎn) pilot does not always hear a controller's order

C．a(chǎn) controller is likely to make more and more mistakes

D．a(chǎn)irports can hardly serve the growing number of airplanes

4．The example in the passage is to show that ________.

[　　]

A．a(chǎn)ir traffic controllers are often careless

B．a(chǎn)ir traffic controllers should pay much attention to avoiding accidents

C．it is difficult for airplanes to avoid terrible accidents

D．two planes should not fly too close to each other

閱讀理解

　　Today, air travel is far safer than driving a car on a busy motorway. But still there is a danger that grows every year. Airliners(n.定期班機(jī),客機(jī))get larger and larger. Some airplanes can carry over 300 passengers. And the air itself becomes more and mere crowded. If one huge airliner struck into another in midair,600 lives could be lost.

　　From the moment an airliner takes off to the moment it lands, every movement is watched on radar screens. Air traffic controllers tell the pilot exactly when to turn, when to climb, and when to come down. The air traffic controllers around a busy airport like London Heathrow may deal with2500 planes a day. Not all of them actually land at the airport. Any plane that flies near the airport comes under the orders of the controllers there. Even a small mistake on their part could cause a terrible accident.

　　Recently such a disaster almost happened. Two large jets(n. 噴氣式飛機(jī))were flying towards the airport. One was carrying 69 passengers from Toronto, the other 176 passengers from Chicago. An air traffic controller noticed on his radar screen that the two planes were too close to each other. He ordered one to turn to the right and to climb. But he made a mistake. He ordered the wrong plane to do this. So, instead of turning away from the second plane, the first plane turned towards it. Fifteen seconds later it flew directly in front of the second plane. They avoided (vt. 避免；回避)each other by the smallest part of a second. The distance between them was less than that of a large swimming pool. This is an example of the danger that grows every, year.

(1)Which of the following is true according to the passage?

[　　]

A．Travelling by air is as safe as by car.

B．Travelling by air is not as safe as by car.

C．Travelling by car is as dangerous as by air.

D．Travelling by ear is more dangerous than by air.

(2)The air traffic controllers of an airport________.

[　　]

A．control all the planes flying near the airport

B．give orders to planes leaving the airport

C．only deal with the planes that want to land there

D．a(chǎn)re allowed to handle 250 planes a day

(3)The danger of air crashes grows every year because________.

[　　]

A．a(chǎn)irliners are getting larger and air traffic is becoming heavier

B．a(chǎn) pilot does not always hear a controller' s order

C．a(chǎn) controller is likely to make more and more mistakes

D．a(chǎn)irports can hardly serve the growing number of air- planes

(4)The example in the passage is to show that________.

[　　]

A．a(chǎn)ir traffic controllers are often careless

B．a(chǎn)ir traffic controllers should pay much attention to a- voiding accidents

C．it is difficult for airplanes to avoid terrible accidents

D．two planes should not fly too close to each other

閱讀理解

　　Today, air travel is far safer than driving a car on a busy motorway. But still there is a danger that grows every year. Airliners(n.定期班機(jī),客機(jī))get larger and larger. Some airplanes can carry over 300 passengers. And the air itself becomes more and mere crowded. If one huge airliner struck into another in midair,600 lives could be lost.

　　From the moment an airliner takes off to the moment it lands, every movement is watched on radar screens. Air traffic controllers tell the pilot exactly when to turn, when to climb, and when to come down. The air traffic controllers around a busy airport like London Heathrow may deal with2500 planes a day. Not all of them actually land at the airport. Any plane that flies near the airport comes under the orders of the controllers there. Even a small mistake on their part could cause a terrible accident.

　　Recently such a disaster almost happened. Two large jets(n. 噴氣式飛機(jī))were flying towards the airport. One was carrying 69 passengers from Toronto, the other 176 passengers from Chicago. An air traffic controller noticed on his radar screen that the two planes were too close to each other. He ordered one to turn to the right and to climb. But he made a mistake. He ordered the wrong plane to do this. So, instead of turning away from the second plane, the first plane turned towards it. Fifteen seconds later it flew directly in front of the second plane. They avoided (vt. 避免；回避)each other by the smallest part of a second. The distance between them was less than that of a large swimming pool. This is an example of the danger that grows every, year.

(1)Which of the following is true according to the passage?

[　　]

A．Travelling by air is as safe as by car.

B．Travelling by air is not as safe as by car.

C．Travelling by car is as dangerous as by air.

D．Travelling by ear is more dangerous than by air.

(2)The air traffic controllers of an airport________.

[　　]

A．control all the planes flying near the airport

B．give orders to planes leaving the airport

C．only deal with the planes that want to land there

D．a(chǎn)re allowed to handle 250 planes a day

(3)The danger of air crashes grows every year because________.

[　　]

A．a(chǎn)irliners are getting larger and air traffic is becoming heavier

B．a(chǎn) pilot does not always hear a controller' s order

C．a(chǎn) controller is likely to make more and more mistakes

D．a(chǎn)irports can hardly serve the growing number of air- planes

(4)The example in the passage is to show that________.

[　　]

A．a(chǎn)ir traffic controllers are often careless

B．a(chǎn)ir traffic controllers should pay much attention to a- voiding accidents

C．it is difficult for airplanes to avoid terrible accidents

D．two planes should not fly too close to each other

.

Today, air travel is far safer than driving a car on a busy motor-way. But still there is a danger that grows every year. Airliners get larger and larger. Some airplanes can carry over 300 passengers. And the air itself becomes more and more crowded. If one large airliner struck into another in midair, 600 lives could be lost.

From the moment an airliner takes off to the moment it lands, every movement is watched on radar screens. Air traffic controllers tell the pilot exactly when to turn, when to climb, and when to come down. The air traffic controllers around a busy airport like London-Heathrow may deal with 2,500 planes a day. Not all of them actually land at the airport. Any plane that flies near the airport comes under the orders of the controllers there. Even a small mistake on their part could cause a terrible accident.

Recently such a disaster almost happened. Two large jets were flying towards the airport. One was carrying 69 passengers from Toronto, the other 176 passengers from Chicago. An air traffic controller noticed on his radar screen that the two planes were too close to each other. He ordered one to turn to the right and to climb．But he made a mistake. He ordered the wrong plane to do this. So, instead of turning away from the second plane, the first plane turned towards it. Fifteen seconds later it flew directly in front of the second plane. They avoided (避免) each other by the smallest part of a second. The distance between them was less than that of a large swimming pool. This is an example of the danger that grows every year.

61. Which of the following is true according to the passage?

A. Traveling by air is as safe as by car．

B. Traveling by air is not as safe as by car．

C. Traveling by car is as dangerous as by air．

D .Traveling by car is more dangerous than by air．

62. The air traffic controllers of an airport ____．

A. control all the planes flying near the airport

B. give orders to planes leaving the airport

C. only deal with the planes that want to land there

D. are allowed to handle 250 planes a day

63. The danger of air crashes grows every year because ____．

A. airliners are getting larger and air traffic is becoming heavier

B. a pilot does not always hear a controller’s order

C. a controller is likely to make more and more mistakes

D. airports can hardly serve the growing number of airplanes

64. The example in the passage is to show that ____．

A. air traffic controllers are often careless

B. air traffic controllers should pay much attention to avoiding accidents

C. it is difficult for airplanes to avoid terrible accidents

D. two planes should not fly too close to each other

.

Today, air travel is far safer than driving a car on a busy motor-way. But still there is a danger that grows every year. Airliners get larger and larger. Some airplanes can carry over 300 passengers. And the air itself becomes more and more crowded. If one large airliner struck into another in midair, 600 lives could be lost.

From the moment an airliner takes off to the moment it lands, every movement is watched on radar screens. Air traffic controllers tell the pilot exactly when to turn, when to climb, and when to come down. The air traffic controllers around a busy airport like London-Heathrow may deal with 2,500 planes a day. Not all of them actually land at the airport. Any plane that flies near the airport comes under the orders of the controllers there. Even a small mistake on their part could cause a terrible accident.

Recently such a disaster almost happened. Two large jets were flying towards the airport. One was carrying 69 passengers from Toronto, the other 176 passengers from Chicago. An air traffic controller noticed on his radar screen that the two planes were too close to each other. He ordered one to turn to the right and to climb．But he made a mistake. He ordered the wrong plane to do this. So, instead of turning away from the second plane, the first plane turned towards it. Fifteen seconds later it flew directly in front of the second plane. They avoided (避免) each other by the smallest part of a second. The distance between them was less than that of a large swimming pool. This is an example of the danger that grows every year.

61. Which of the following is true according to the passage?

   A. Traveling by air is as safe as by car．

   B. Traveling by air is not as safe as by car．

   C. Traveling by car is as dangerous as by air．

   D .Traveling by car is more dangerous than by air．

62. The air traffic controllers of an airport ____．

   A. control all the planes flying near the airport

   B. give orders to planes leaving the airport

   C. only deal with the planes that want to land there

   D. are allowed to handle 250 planes a day

63. The danger of air crashes grows every year because ____．

   A. airliners are getting larger and air traffic is becoming heavier

   B. a pilot does not always hear a controller’s order

   C. a controller is likely to make more and more mistakes

   D. airports can hardly serve the growing number of airplanes

64. The example in the passage is to show that ____．

A. air traffic controllers are often careless

B. air traffic controllers should pay much attention to avoiding accidents

C. it is difficult for airplanes to avoid terrible accidents

D. two planes should not fly too close to each other