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. reduced to

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

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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 题意：辐射应该减少到最小。短文最后一段提到“那就是为什么在所有的透视计划中辐射应该减少到最小的原因”，由此可知辐射应该减少到最小，故选F。
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