26. Plants will emit an increased amount of heat when they are _______
A) sprayed with pesticides B) facing an infrared scanner
C) in poor physical condition D) exposed to excessive sun rays
27. 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 color-coded map
D) locate the problem area
28. 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
29. 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 D) its failure to help increase production
答案解析:
这是一篇说明文。文章一开头就介绍了原用于军事和卫星的红外线扫描技术,如今被用在农业上。通过远距离测量植物的温度来判断农作物是否遭受虫害和疾病。在第二段中指出,物理学家帕里组建了帕里远红外扫描服务公司,来专门探测农业方面的情况。最后他的公司在三年后被迫关闭,主要是因为缺乏资金。另外,农民们也一时不能接受这种新技术。作者期待将来有一天可以解决财政困难,将这一新技术重新用到农业上去。
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