2. 外语
  3. 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

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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