问题
选择题
to nuclear radiation, even for a short time, may produce variants(变异)of genes in human bodies. [ ]
A. Having exposed
B. Being exposed
C. Exposed
D. After being exposed
答案
答案：B
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to nuclear radiation, even for a short time, may produce variants(变异)of genes in human bodies. [ ]
A. Having exposed
B. Being exposed
C. Exposed
D. After being exposed
答案：B