欧美日韩黄网欧美日韩日B片|二区无码视频网站|欧美AAAA小视频|久久99爱视频播放|日本久久成人免费视频|性交黄色毛片特黄色性交毛片|91久久伊人日韩插穴|国产三级A片电影网站|亚州无码成人激情视频|国产又黄又粗又猛又爽的

Scientists are working to develop crop plants that can reduce the amount of water used for agriculture. Almost sixty percent of the world’s freshwater withdrawals from rivers, lakes and other water resources go toward irrigating fields.

Scientists are using biotechnology as well as traditional breeding methods to develop water-saving crops to feed a growing world.

Thomas “Tommy” Carter is a plant scientist in North Carolina. He works for the Agricultural Research Service in the United States Department of Agriculture. He leads Team Drought, a group of researchers at five universities. They have been using conventional breeding methods to develop and test soybeans that can grow well under dry conditions.

Tommy Carter started working on drought-resistant soybeans in 1981. His research has taken him as far as China, where soybeans have been grown for thousands of years.

Farmers in the United States, however, have grown soybeans for only about a century. Tommy Carter says the soybeans they grow are for the most part genetically similar. More differences could better protect crops against climate changes that can reduce production. Those changes include water shortages which could increase from global warming.

The Agriculture Department has a soybean germplasm(胚質(zhì)) collection, a collection of genetic material passed from one generation to the next. Members of Team Drought studied more than 2,500 examples from the collection.

They looked at ones from the home of soybeans, Asia. They searched for germplasms that could keep plants from weakening and wilting (凋謝)during hot, dry summers in the United States.

Tommy Carter says they found only five. But these slow-wilting lines, he says, produce four to eight bushels（英斗）more than normal soybeans under drought conditions. The yield depends on location and environment.

Scientists are also working on other plants that either use less water or use it better, or both. For example, companies like Monsanto, DuPont and Syngenta have been developing corn with reduced water needs. Monsanto expects to be ready in a few years to market its first corn seeds genetically engineered to resist drought.

1. According to the passage, scientists try to find out how to _______.

A. grow crops with less water

B. increase crop production

C. feed a growing world

D. save the world’s water resource

2. Why did Tommy Carter come to China?

   A. He likes traveling.

   B. China has a long history.

   C. He’s doing research into soybeans.

   D. He works for the Agricultural Research Service.

3. What’s inferred from the passage?

   A. Climate changes lead to global warming.

   B. Water shortages contribute to global warming.

   C. Genetically different soybeans need much water to grow.

   D. Genetically different soybeans help to fight against damaging climate changes.

4. What do we know about slow-wilting plants talked about in the passage?

   A. They yield big profits.

   B. They can grow in almost any climate.

   C. They seem to be drought-resistant.

   D. They need much water for their growth.

Scientists are working to develop crop plants that can reduce the amount of water used for agriculture．Almost sixty percent of the world’s fresh water taken from rivers, lakes and other water resources go toward watering fields．

Thomas Carter is a plant scientist and he leads a group of researchers．They have been using traditional methods to develop and test soybeans（大豆）that can grow well under dry conditions．Thomas started working on soybeans in 1981．His research has taken him to as far as China, where soybeans have been grown for thousands of years．Farmers in the United States, however, have grown soybeans for only about a century．Thomas says the soybeans they grow are genetically（基因方面）similar．More differences could protect crops against climate changes that can reduce production．Those changes include water shortages which could increase because of global warming．

Thomas and his members are working on a soybean seed collection, a collection of genetic material passed from one generation to the next．They studied more than two thousand five hundred examples from the collection which are from the home of soybeans, Asia．They searched for good seeds that could survive during hot and dry summers in the United States．Unfortunately, they found only five after a few days’ hard work．But what pleases them much is that these seeds produce four to eight ones more than normal soybeans under dry conditions．The yield（產(chǎn)量）depends on location and the environment．Scientists will also work on other crops that either use less water or use it better．

68．Thomas Carter and his research group do research on soybeans to      ．

       A．have them survive a sharp climate change 

      B．make them grow well under dry conditions

       C．plant them all around the world    

       D．increase crop production and quality

69．According to the passage, climate changes can      ．

       A．reduce crop yield             B．protect crops

       C．destroy seeds                 D．change the genes of crops

70．Which of the following can be inferred from the passage?

       A．Thomas and his group have made some achievements．

       B．People know a little about the relationship between water and crops．

       C．Seed collections depend on climate and the environment．

       D．Some crops can grow well during cold and dry winters．

71．The passage is probably taken from      ．

       A．a(chǎn) report on how to save water           B．a(chǎn) book on the environment

       C．a(chǎn) science magazine                    D．a(chǎn)n ad for agricultural products

 

Scientists are working to develop crop plants that can reduce the amount of water used for agriculture. Almost sixty percent of the world’s freshwater withdrawals from rivers, lakes and other water resources go toward irrigating fields.

Scientists are using biotechnology as well as traditional breeding methods to develop water-saving crops to feed a growing world.

Thomas “Tommy” Carter is a plant scientist in North Carolina. He works for the Agricultural Research Service in the United States Department of Agriculture. He leads Team Drought, a group of researchers at five universities. They have been using conventional breeding methods to develop and test soybeans that can grow well under dry conditions.

Tommy Carter started working on drought-resistant soybeans in 1981. His research has taken him as far as China, where soybeans have been grown for thousands of years. 

Farmers in the United States, however, have grown soybeans for only about a century. Tommy Carter says the soybeans they grow are for the most part genetically similar. More differences could better protect crops against climate changes that can reduce production. Those changes include water shortages which could increase from global warming.

The Agriculture Department has a soybean germplasm(胚質(zhì)) collection, a collection of genetic material passed from one generation to the next. Members of Team Drought studied more than 2,500 examples from the collection.

They looked at ones from the home of soybeans, Asia. They searched for germplasms that could keep plants from weakening and wilting (凋謝)during hot, dry summers in the United States.

Tommy Carter says they found only five. But these slow-wilting lines, he says, produce four to eight bushels（英斗）more than normal soybeans under drought conditions. The yield depends on location and environment.

Scientists are also working on other plants that either use less water or use it better, or both. For example, companies like Monsanto, DuPont and Syngenta have been developing corn with reduced water needs. Monsanto expects to be ready in a few years to market its first corn seeds genetically engineered to resist drought. 

1.According to the passage, scientists try to find out how to _______.

A. grow crops with less water

B. increase crop production

C. feed a growing world

D. save the world’s water resource

2.Why did Tommy Carter come to China?

   A. He likes traveling.

   B. China has a long history.

   C. He’s doing research into soybeans.

   D. He works for the Agricultural Research Service.

3.What’s inferred from the passage?

   A. Climate changes lead to global warming.

   B. Water shortages contribute to global warming.

   C. Genetically different soybeans need much water to grow.

   D. Genetically different soybeans help to fight against damaging climate changes.

4.What do we know about slow-wilting plants talked about in the passage?

   A. They yield big profits.

   B. They can grow in almost any climate.

   C. They seem to be drought-resistant.

   D. They need much water for their growth.

 

Scientists are working to develop crop plants that can reduce the amount of water used for agriculture. Almost sixty percent of the world’s freshwater withdrawals from rivers, lakes and other water resources go toward irrigating fields.

Scientists are using biotechnology as well as traditional breeding methods to develop water-saving crops to feed a growing world.

Thomas “Tommy” Carter is a plant scientist in North Carolina. He works for the Agricultural Research Service in the United States Department of Agriculture. He leads Team Drought, a group of researchers at five universities. They have been using conventional breeding methods to develop and test soybeans that can grow well under dry conditions.

Tommy Carter started working on drought-resistant soybeans in 1981. His research has taken him as far as China, where soybeans have been grown for thousands of years.

Farmers in the United States, however, have grown soybeans for only about a century. Tommy Carter says the soybeans they grow are for the most part genetically similar. More differences could better protect crops against climate changes that can reduce production. Those changes include water shortages which could increase from global warming.

The Agriculture Department has a soybean germplasm(胚質(zhì)) collection, a collection of genetic material passed from one generation to the next. Members of Team Drought studied more than 2,500 examples from the collection.

They looked at ones from the home of soybeans, Asia. They searched for germplasms that could keep plants from weakening and wilting (凋謝)during hot, dry summers in the United States.

Tommy Carter says they found only five. But these slow-wilting lines, he says, produce four to eight bushels（英斗）more than normal soybeans under drought conditions. The yield depends on location and environment.

Scientists are also working on other plants that either use less water or use it better, or both. For example, companies like Monsanto, DuPont and Syngenta have been developing corn with reduced water needs. Monsanto expects to be ready in a few years to market its first corn seeds genetically engineered to resist drought.

68. According to the passage, scientists try to find out how to _______.

A. grow crops with less water

B. increase crop production

C. feed a growing world

D. save the world’s water resource

69. Why did Tommy Carter come to China?

   A. He likes traveling.

   B. China has a long history.

   C. He’s doing research into soybeans.

   D. He works for the Agricultural Research Service.

70. What’s inferred from the passage?

   A. Climate changes lead to global warming.

   B. Water shortages contribute to global warming.

   C. Genetically different soybeans need much water to grow.

   D. Genetically different soybeans help to fight against damaging climate changes.

71. What do we know about slow-wilting plants talked about in the passage?

   A. They yield big profits.

   B. They can grow in almost any climate.

   C. They seem to be drought-resistant.

   D. They need much water for their growth.

Scientists are working to develop crop plants that can reduce the amount of water used for agriculture．Almost sixty percent of the world’s freshwater withdrawals from rivers, lakes and other water resources go toward irrigating fields.

Scientists are using biotechnology as well as traditional breeding methods to develop water-saving crops to feed a growing world.

Thomas “Tommy” Carter is a plant scientist in North Carolina．He works for the Agricultural Research Service in the United States Department of Agriculture．He leads Team Drought, a group of researchers at five universities．They have been using conventional breeding methods to develop and test soybeans that can grow well under dry conditions.

Tommy Carter started working on drought-resistant soybeans in 1981．His research has taken him as far as China, where soybeans have been grown for thousands of years．

Farmers in the United States, however, have grown soybeans for only about a century．Tommy Carter says the soybeans they grow are for the most part genetically similar．More differences could better protect crops against climate changes that can reduce production．Those changes include water shortages which could increase from global warming.

The Agriculture Department has a soybean germplasm（胚質(zhì)） collection, a collection of genetic material passed from one generation to the next．Members of Team Drought studied more than 2,500 examples from the collection.

They looked at ones from the home of soybeans, Asia．They searched for germplasms that could keep plants from weakening and wilting （凋謝）during hot, dry summers in the United States.

Tommy Carter says they found only five．But these slow-wilting lines, he says, produce four to eight bushels（英斗）more than normal soybeans under drought conditions．The yield depends on location and environment.

Scientists are also working on other plants that either use less water or use it better, or both．For example, companies like Monsanto, DuPont and Syngenta have been developing corn with reduced water needs．Monsanto expects to be ready in a few years to market its first corn seeds genetically engineered to resist drought．

1．According to the passage, scientists try to find out how to _______.

  A．grow crops with less water                  B．increase crop production

  C．feed a growing world                           D．save the world’s water resource

2．Why did Tommy Carter come to China?

     A．He likes traveling.

     B．China has a long history.

     C．He’s doing research into soybeans.

     D．He works for the Agricultural Research Service.

3．What’s inferred from the passage?

     A．Climate changes lead to global warming.

     B．Water shortages contribute to global warming.

     C．Genetically different soybeans need much water to grow.

     D．Genetically different soybeans help to fight against damaging climate changes.

4．What do we know about slow-wilting plants talked about in the passage?

     A．They yield big profits.

     B．They can grow in almost any climate.

     C．They seem to be drought-resistant.

     D．They need much water for their growth.