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.
【39】
选项 A、even if
B、if only
C、only if
D、though
答案C
解析 此题属于语篇衔接，根据文章内容，佩利想重操旧业，遥感技术也得到了专家的认同，但佩利还须取得别人在经济上的资助才能实现他的想法，故选项Conly if符合题意。选项A even if表示“即使”，引导让步状语从句；选项Bif only省略主句的条件句，表示期望，愿望，例如：If only he were with us!(如果他和我们在一起该多好呀!)选项Dthough表示“但是”，表示转折关系。
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