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 该题可直接借助搭配句意判断答案。也可借助原文(利用问题句中的infrared，heat作为答案线索词)，在第三段第四句找到答案相关句：Infrared(红外线的)radiation is an electromagnetic wave．When it is absorbed by matter，heat is produced．
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