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______ to nuclear radiation, even for a short time, may produce variants(变异体) of genes in human bodies.

  A. Being exposed    B. Having exposed

  C. Exposed          D. After being exposed

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科目:高中英语 来源:2013届浙江省宁波市效实中学高三上学期期中考试英语试卷(带解析) 题型:单选题

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科目:高中英语 来源:江苏省教育集团树人学校09-10学年高二下学期期中考试(英语) 题型:单项填空

____ to nuclear radiation, even for a short time, may produce variants of genes in human body.

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单词拼写 (共10小题;每小题1分,满分10分)

根据首字母或汉语意思,在句中填入适当的词。

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