D. detecting crop problems at an early stage
解析 细节理解题。依据文章第二自然段最后一句“Farmers could then spotspray, 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。
答案 A
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 推理判断题。依据文章第三自然段的第1句“The bad news is that Palely’s company closed down in 1984,after only three years.Farmers resisted the new technology and longterm backers were hard to find”,从中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 Palely 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。
答案 C
5.Infrared scanning technology may be brought back into operation because of________.
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