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

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

admin2010-07-24  75
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 (红外线的) 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 cold detect crop problems before they became visible to the eye. Mounted on a plane flown at 3,000 feet at night, an infra-red 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 infra-red 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 Other of Texas A&M. Ray Jackson, who recently retired from the Department of Agriculture, thinks remote infra-red 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.
In order to apply pesticide spraying precisely, we can use infra-red scanning to ______.
选项 A、estimate the damage to the crops
B、draw a color-coded map
C、measure the size of the affected area
D、locate the problem area
答案D
解析 第一段最后一句话中使用了“rather than”这个短语，表达的是让农场主可以准确地target。target在这里的意思是“锁定”，而locate表示的是“定位”，其意思一样。扫描的主要目的在于让人们对准目标喷洒农药，而不是下“满天雨”。
转载请注明原文地址:https://kaotiyun.com/show/PyN7777K
0

大学英语四级

相关试题推荐
随机试题
最新回复(0)