A. estimate the damage to the crops B. measure the size of the affected area C. draw a color-coded map D. locate the problem area 【解析】选D。推理判断题。本题考查使用红外线扫描技术的目的。依据文章第二段“. . . showing where plants were running ‘fevers’. Farmers could then spot-spray,. . . ”说明目的是确定有问题的区域,以使农民有针对性地喷杀虫剂。显然,选项D(确定有问题的地域)为最佳选项。 3. Farmers can save a considerable amount of pesticide by _____ .
A. resorting to spot-spraying B. consulting infrared scanning experts C. transforming poisoned rain D. detecting crop problems at an early stage 【解析】选A。细节理解题。依据文章第二段最后一句“Farmers could then spot-spray, using 50 to 70 percent less pesticide than they otherwise would. ”(采取点喷,农民们可以节省平时用量的50%至70%的杀虫剂),选项A符合题意。 4. The application of infrared scanning technology to agriculture met with some difficulties— _____ .
A. the lack of official support B. its high cost C. the lack of financial support D. its failure to help increase production 【解析】选C。推理判断题。依据文章第三段的“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. ”,可以看出红外线扫描技术应用于农业遇到了一些问题,原因有两个:一是农民对新技术的抵制,二是难以找到长期赞助商。文章中还有一处明显的提示出现在最后一句:“But only if Paley finds the financial backing which he failed to obtain 10 years ago. ”从该句提供的信息同样可以反推出10年前的情形,所以选项C正确。 5. Infrared scanning technology may be brought back into operation because of _____ .
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