A. when it is absorbed by matter B. when it is cloudy C. because they can pass through solid objects D. when the sunrays are fie

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问题 A. when it is absorbed by matter
B. when it is cloudy
C. because they can pass through solid objects
D. when the sunrays are fierce
E. when a change in the nucleus of an atom takes place
F. when electron rearrangement takes place
Infrared radiation can produce heat______.

选项

答案A

解析 根据题干线索词infrared radiations可将原文定位至第三段第三、四句Infrared(红外线的)radiation is an electromagnetic wave.When it is absorbed by matter,heat is produced.其中后一句中的it即指infrared radiations。A选项是对原句的同义改写,故A为正确答案。
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