Plants will emit an increased amount of heat when they are ______. In order to apply pesticide spraying precisely, we can use i

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问题 Plants will emit an increased amount of heat when they are ______.
In order to apply pesticide spraying precisely, we can use infrared scanning to ______.

选项 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

答案D

解析 依据文章第二段第四行,说明目的是确定有问题的区域,以使农民有针对性地使用杀虫剂。
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