单选题Directions: Read the following text. Answer
the questions on each text by choosing A, B, C or D. 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 3000 feet away—straight up. A decade ago, adapting the
infrared (红外线) scanning technology developed for military purposes and other
satelities, physicist Stephen Paley came up with a quick way to take the
temperature of crops to determine which ones were under stress. The goal was to
let farmers precisely target pesticide (杀虫刹) 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 3000 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 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 if Paley finds the
financial backing which he failed to obtain 10 years ago.
单选题
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
【正确答案】
C
【答案解析】[解析] 细节题。根据文章的第二段可知植物在“发烧”，只有在植物状况不佳时才会散发热。
单选题
In order to apply pesticide spraying precisely, we can use infrared
scanning to ______.