(单选题)

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

参考答案：C

参考解析：

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 color-coded map showing where plants were running’evers’”，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。

知识点：阅读理解四选一英语专业基础知识阅读理解教师招聘-小学英语