名校最新大学英语四级阅读精讲的系列讲义：(159)_大学英语阅读

　　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

　　30. Infrared scanning technology may be brought back into operation because of _______.

　　A) the desire of farmers to improve the quality of their produce.

　　B) growing concern about the excessive use of pesticides on crops

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