江苏省扬中教育集团树人学校09-10学年高二下学期期中考试（英语）

适用年级：高二
试卷号：68885

试卷类型：期中
试卷考试时间：2017/7/20

1.单项选择(共1题)

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

A．Exposed	B．Being exposed
C．Having exposed	D．After being exposed

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试卷分析