B. facing an infrared scanner
C. in poor physical condition
D. exposed to excessive sun rays
解析 细节理解题。依据文章第二自然段第2行“...an infrared scanner measured the heat emitted by crops.The data were transformed into a colorcoded map showing where plants were running‘fevers’”,说明植物在发“高烧”,也就是说,“身体状况”不佳时才会散发热,所以选项C符合题意。
答案 C
2.In order to apply pesticide spraying precisely, we can use infrared scanning to________.
A. estimate the damage to the crops
B. measure the size of the affected area
C. draw a colorcoded map
D. locate the problem area
解析 推理判断题。本题要求判断使用红外线扫描技术的目的。依据文章第二自然段第4行“...showing where plants were running ‘fevers’.Farmers could then spotspray,...”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。
答案 D
3.Farmers can save a considerable amount of pesticide by________.
A. resorting to spotspraying
B. consulting infrared scanning experts
C. transforming poisoned rain
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