2. 外语
  3. Even plants can run a fever, especially when they are under attack by insects or disease.But【21】______ humans, plants can have

Even plants can run a fever, especially when they are under attack by insects or disease.But【21】______ humans, plants can have

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问题    Even plants can run a fever, especially when they are under attack by insects or disease.But【21】______  humans, plants can have their temperature 【22】______  from 3,000 feet away— straight up. A decade ago, 【23】______  the infrared(红外线的)scanning technology developed for military purpose and other satellites, physicist Stephen Paley 【24】______  a quick way to take the temperature of crops to determine 【25】______  ones are under stress. The goal was to let farmer 【26】______  target pesticide spraying 【27】______  rain poison on a whole field, which 【28】______  include plants that don’t have the pest problem.
   Even better, Paley’s Remote Scanning Services Company could detect crop problem before they became 【29】______  to the eye. Mounted on a plane flown at 3,000 feet 【30】______ , an infrared scanner measured the heat emitted by crops. The data were 【31】______  into a color-coded map showing 【32】______  plants were running "fevers". Farmers could then spot spray, using 50 to 70 percent less pesticide than they 【33】______  would.
   The bad news is that Paley’s company closed down in 1984, after only three years. Farmers 【34】______  the new technology and long-term backers were hard 【35】______ . But with the renewed concern about pesticides on produce, and refinements in infrared scanning, Paley hopes to 【36】______  into operation. Agriculture experts have no doubt the technology works. "This technique can be used 【37】______  75 percent of agricultural land in the United States," says George Oerther of Texas A&M. Ray Jackson, who recently retired from the Depart ment of Agriculture, thinks 【38】______  infrared crop scanning could be adopted by the end of the decade. But 【39】______  Paley finds the financial backing 【40】______  he failed to obtain 10 years ago.
【29】
选项 A、seeming
B、clear
C、apparent
D、visible
答案D
解析 此题属于语意搭配题。visible表示“看得见的”，根据句意。：红外扫描技术可以在人们用肉眼看到病虫害之前就测出哪些庄稼会有问题，故选项Dvisible正确。选项Aseeming表示“看起来”；选项Bclear表示“清楚的”；选项Capparent表示“显然的，貌似的”。
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