Directions: Read the following passage.
问题：
Directions: Read the following passage. Answer the questions according to the information given in the
passage and the required words limit.
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 sent
out 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 that 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 (改进) ininfrared 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, 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. In what situation will plants have a fever? (No more than 8 words)
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2. How can we apply pesticide spraying precisely? (No more than 10 words)
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3. Why may infrared scanning technology by brought back into operation? (No more than 13 words)
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4. What is the biggest problem that might prevent bringing infrared scanning technology back? (No more than
7 words)
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