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
X-rays and gamma rays can be used to detect and treat cancer______.
选项
答案C
解析 可借助搭配句意直接确认答案C。也可借助原文(X—rays，gamma rays作为答案线索词)，在第三段倒数第三句找到答案相关句：X—rays and gamma rays have so mush energy that they travel rightthrough solid objects．They can be used to detect and treat cancer．
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