2. 外语
  3. A. be costly B. harmful C. save a life D. still open to debate E. reduce the risk of radiation triggering a cancer F. reduc

A. be costly B. harmful C. save a life D. still open to debate E. reduce the risk of radiation triggering a cancer F. reduc

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问题 A. be costly
B. harmful
C. save a life
D. still open to debate
E. reduce the risk of radiation triggering a cancer
F. reduced to the minimum  
Radiation exposure should be ______.
选项
答案F
解析 选项F讲到：应把受到的辐射降低到最小。文章的最后一句证明选项F是正确的。
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