Even plant can run a fever, especially when they’re under attack by insects or disease. But unlike human, plants can have their temperature taken from 3, 000 feet away - straight up. A decade ago, adopting the infrared （红外线）scanning technology developed for military purposes and other satellites, physicist Stephen Paley came up with a quick way to take the temperature of crops to determine which ones are under stress. The goal was to let farmers precisely target pesticide （杀虫剂）spraying rather than rain poison on a whole field, which invariably includes plants that don’t have pest （害虫）problems.

　　Even better, Paley’s Remote Scanning Services Company could detect crop problems before they became visible to the eye. Mounted on a plane flown at 3, 000 feet at night, an infrared scanner measured the heat emitted by crops. The data were transformed into a color - coded map showing where plants were running“ fevers”. Farmers could then spot - spray, using 50 to 70 percent less pesticide than they otherwise would.

　　The bad news is that Paley’s company closed down in 1984, after only three years. Farmers resisted the new technology and long - term backers were hard to find. But with the renewed concern about pesticides on produce, and refinements in infrared scanning, Paley hopes to get back into operation. Agriculture experts have no doubt the technology works. “This technique can be used on 75 percent of agricultural land in the United States, ” says George Oerther of Texas A & M. Ray Jackson , who recently retired from the Department of Agriculture, thinks remote infrared crop scanning could be adopted by the end of the decade. But only ff Paley finds the financial backing which he failed to obtain 10 years ago.

　56．Plants will emit an increased amount of heat when they are________.

　　A. sprayed with pesticides     B. facing an infrared scanner

　　C. in poor physical condition   D. exposed to excessive sun rays

　57．In order to apply pesticide spraying precisely, we can use infrared scanning to________.

　　A. estimate the damage to the crops    B. measure the size of the affected area

　　C. draw a color -coded map          D. locate the problem area

　58．Farmers can save a considerable amount of pesticide by________.

　　A. resorting to spot – spraying   B. consulting infrared scanning experts

　　C. transforming poisoned rain    D. detecting crop problems at an early stage

　59．The application of infrared scanning technology to agriculture met with some difficulties________.,

　　A. the lack of official support        B. its high cost

　　C. the lack of financial support      D. its failure to help increase production

　60．Infrared scanning technology may be brought back into operation because of________.

　　A. the desire of farmers to improve the quality of their produce

　　B. growing concern about the excessive use of pesticides on crops

　　C. the forceful promotion by the Department of Agriculture

　　D. full support from agricultural experts

　　Even plant can run a fever, especially when they’re under attack by insects or disease. But unlike human, plants can have their temperature taken from 3, 000 feet away - straight up. A decade ago, adopting the infrared （红外线）scanning technology developed for military purposes and other satellites, physicist Stephen Paley came up with a quick way to take the temperature of crops to determine which ones are under stress. The goal was to let farmers precisely target pesticide （杀虫剂）spraying rather than rain poison on a whole field, which invariably includes plants that don’t have pest （害虫）problems.
　　Even better, Paley’s Remote Scanning Services Company could detect crop problems before they became visible to the eye. Mounted on a plane flown at 3, 000 feet at night, an infrared scanner measured the heat emitted by crops. The data were transformed into a color - coded map showing where plants were running“ fevers”. Farmers could then spot - spray, using 50 to 70 percent less pesticide than they otherwise would.
　　The bad news is that Paley’s company closed down in 1984, after only three years. Farmers resisted the new technology and long - term backers were hard to find. But with the renewed concern about pesticides on produce, and refinements in infrared scanning, Paley hopes to get back into operation. Agriculture experts have no doubt the technology works. “This technique can be used on 75 percent of agricultural land in the United States, ” says George Oerther of Texas A & M. Ray Jackson , who recently retired from the Department of Agriculture, thinks remote infrared crop scanning could be adopted by the end of the decade. But only ff Paley finds the financial backing which he failed to obtain 10 years ago.
　56．Plants will emit an increased amount of heat when they are________.
　　A. sprayed with pesticides     B. facing an infrared scanner
　　C. in poor physical condition   D. exposed to excessive sun rays
　57．In order to apply pesticide spraying precisely, we can use infrared scanning to________.
　　A. estimate the damage to the crops    B. measure the size of the affected area
　　C. draw a color -coded map          D. locate the problem area
　58．Farmers can save a considerable amount of pesticide by________.
　　A. resorting to spot – spraying   B. consulting infrared scanning experts
　　C. transforming poisoned rain    D. detecting crop problems at an early stage
　59．The application of infrared scanning technology to agriculture met with some difficulties________.,
　　A. the lack of official support        B. its high cost
　　C. the lack of financial support      D. its failure to help increase production
　60．Infrared scanning technology may be brought back into operation because of________.
　　A. the desire of farmers to improve the quality of their produce
　　B. growing concern about the excessive use of pesticides on crops
　　C. the forceful promotion by the Department of Agriculture
　　D. full support from agricultural experts

  Even plant can run a fever, especially when they’re under attack by insects or diseases. But unlike humans, plants can have their temperature taken from 3, 000 feet away - straight up. A decade ago, adopting the infrared（红外线）scanning technology developed for military purposes and other satellites, physicist Stephen Paley came up with a quick way to take the temperature of crops to determine which ones are under stress. The goal was to let farmers precisely target pesticide（杀虫剂）spraying rather than rain poison on a whole field, which invariably includes plants that don’t have pest（害虫）problems.

　　Even better, Paley’s Remote Scanning Services Company could detect crop problems before they became visible to the eye. Mounted on a plane flown at 3, 000 feet at night, an infrared scanner measured the heat emitted by crops. The data were transformed into a color-coded map showing where plants were running “fevers”. Farmers could then spot-spray, using 50 to 70 percent less pesticide than they otherwise would.

　　The bad news is that Paley’s company closed down in 1984, after only three years. Farmers resisted the new technology and long-term backers were hard to find. But with the renewed concern about pesticides on produce, and refinements in infrared scanning, Paley hopes to get back into operation. Agriculture experts have no doubt that technology works. “This technique can be used on 75 percent of agricultural land in the United States, ” says George Oerther of Texas A & M. Ray Jackson , who recently retired from the Department of Agriculture, thinks remote infrared crop scanning could be adopted by the end of the decade. But only if Paley finds the financial backing which he failed to obtain 10 years ago.

1.Plants will emit an increased amount of heat when they are________.

　 A. sprayed with pesticides              B. facing an infrared scanner

　 C. in poor physical condition            D. exposed to excessive sun rays

2.In order to apply pesticide spraying precisely, we can use infrared scanning to____.

　 A. estimate the damage to the crops       B. measure the size of the affected area

　 C. draw a color -coded map                D. locate the problem area

3.Farmers can save a considerable amount of pesticide by________.

　 A. resorting to spot – spraying           B. consulting infrared scanning experts

　 C. transforming poisoned rain           D. detecting crop problems at an early stage

4.The application of infrared scanning technology to agriculture met with some difficulties due to ________.,

　 A. the lack of official support               B. its high cost

　 C. the lack of financial support              D. its failure to help increase production

　　Even plant can run a fever, especially when they’re under attack by insects or disease. But unlike human, plants can have their temperature taken from 3, 000 feet away - straight up. A decade ago, adopting the infrared （红外线）scanning technology developed for military purposes and other satellites, physicist Stephen Paley came up with a quick way to take the temperature of crops to determine which ones are under stress. The goal was to let farmers precisely target pesticide （杀虫剂）spraying rather than rain poison on a whole field, which invariably includes plants that don’t have pest （害虫）problems.

　　Even better, Paley’s Remote Scanning Services Company could detect crop problems before they became visible to the eye. Mounted on a plane flown at 3, 000 feet at night, an infrared scanner measured the heat emitted by crops. The data were transformed into a color - coded map showing where plants were running“ fevers”. Farmers could then spot - spray, using 50 to 70 percent less pesticide than they otherwise would.

　　The bad news is that Paley’s company closed down in 1984, after only three years. Farmers resisted the new technology and long - term backers were hard to find. But with the renewed concern about pesticides on produce, and refinements in infrared scanning, Paley hopes to get back into operation. Agriculture experts have no doubt the technology works. “This technique can be used on 75 percent of agricultural land in the United States, ” says George Oerther of Texas A & M. Ray Jackson , who recently retired from the Department of Agriculture, thinks remote infrared crop scanning could be adopted by the end of the decade. But only ff Paley finds the financial backing which he failed to obtain 10 years ago.

　56．Plants will emit an increased amount of heat when they are________.

　　A. sprayed with pesticides     B. facing an infrared scanner

　　C. in poor physical condition   D. exposed to excessive sun rays

　57．In order to apply pesticide spraying precisely, we can use infrared scanning to________.

　　A. estimate the damage to the crops    B. measure the size of the affected area

　　C. draw a color -coded map          D. locate the problem area

　58．Farmers can save a considerable amount of pesticide by________.

　　A. resorting to spot – spraying   B. consulting infrared scanning experts

　　C. transforming poisoned rain    D. detecting crop problems at an early stage

　59．The application of infrared scanning technology to agriculture met with some difficulties________.,

　　A. the lack of official support        B. its high cost

　　C. the lack of financial support      D. its failure to help increase production

　60．Infrared scanning technology may be brought back into operation because of________.

　　A. the desire of farmers to improve the quality of their produce

　　B. growing concern about the excessive use of pesticides on crops

　　C. the forceful promotion by the Department of Agriculture

　　D. full support from agricultural experts

In 1985, scientists reported a change in the atmosphere, a hole or thinning of ozone（臭氧层）over Antarctica. Scientists were not sure what was causing.

Most scientists believe that man-made chemicals are destroying the ozone. They also have found signs of ozone loss in other parts of the atmosphere.

Ozone is found both in the air we breathe and in the upper atmosphere. Near the earth, ozone in the air is a danger to life. It is a waste product. But ozone found 10 to 50 kilometers up in the atmosphere protects life on earth.  Ozone is formed in the atmosphere through the action of solar radiation. Once formed, the ozone blocks harmful radiation from reaching the earth. Scientists say a reduction in ozone and an increase in the harmful radiation will cause many more cases of skin cancer and will harm crops, animals and fishes.

The report said it is about 8 degrees colder 15 kilometers above earth than it was in 1979. Scientists think the first loss of ozone reduces the amount of solar energy the atmosphere can take in. This cools the atmosphere, increases ice cloud production and leads to more ozone loss.

Scientists found signs the ozone problem has spread. The study shows that the loss of ozone over the areas with larger population in North America and Europe was at least three times greater than scientists had thought. The ozone levels reduced much more seriously during winter months than in warmer months. This is not surprising because the amount of ozone in the atmosphere changes with the temperature.

An international effort is being made to stop the loss of ozone in the atmosphere. But many experts fear that the effort will not produce results fast enough to prevent harm to life on the earth.

1. The text is mainly about_______.

A. a change in atmosphere    　　　　　　　　　　 B. the solar radiation

C. the ozone problem　　　　　　　　　　　　　　　　 D. a hole in Antarctica

2. According to the text, which of the following statements is true?

A. Ozone in the atmosphere is a danger to life.

B. Since ozone in the air is harmful to life, the less ozone in the atmosphere the better.

C. Ozone is a kind of man-made chemical product.

D. The ozone up above us can stop harmful radiation from getting to the earth.

3. The loss of ozone may be caused by the following conditions except for_______.

A. the amount of solar energy　　　　　　　　　　　　    B. the colder temperature

C. the larger population　　　　　　　　　　　　　　  D. man-made chemicals

4. From the text we have learned that_______.

A. the scientists have done a great deal to stop getting warm on the earth

B. the temperature in 1979 was much colder than it is now

C. ozone holds solar energy and helps atmosphere take it in

D. successful efforts have been made to stop the loss of the ozone

5. This text mostly wants to_______.

A. draw people’s interest in atmosphere

B. call the public attention to ozone problem

C. help people to know the change in air

D. make people know the information above us