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  3. Even plants can run a fever, especially when they’ re under attack by insects or disease. But unlike humans, plants can have the

Even plants can run a fever, especially when they’ re under attack by insects or disease. But unlike humans, plants can have the

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问题     Even plants can run a fever, especially when they’ re under attack by insects or disease. But unlike humans, plants can have their temperature taken from 3 ,000 feet away—straight up. A decade ago, adapting 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 attack. The goal was to let farmers precisely target pesticide(杀虫剂)spraying rather than rain poison on a whole field, which always 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. An infrared scanner, on a plane flying at 3,000 feet at night, measured the heat sent out by crops. The data was turned 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 supporters 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 about how 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 long-distance infrared crop scanning could be adopted by the end of the decade, but only if Paley finds the financial support which he failed to obtain 10 years ago.
The passage mainly talks about the______.
选项 A、problems of crops
B、temperature of plants
C、roles of Paley’s company
D、function of infrared scanning
答案D
解析 通读全文可知，本文主要介绍了一种通过红外线扫描定位生病植物，然后定点喷洒农药，以节约农药，提高生产效率的方法。选项A、B、C均不能概括文章大意。故选D。
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