题目内容
7._____ to nuclear radiation even for a short time may produce variants of genes in human bodies,( )A. | Being exposed | B. | Having exposed | ||
C. | Exposed | D. | After being exposed |
分析 暴露在核辐射下哪怕很短的时间也会造成人体内基因的变异.
解答 答案:A
题干中expose to nuclear radiation even for a short time是作主语,要用动名词形式;be exposed to暴露在…之下,搭配短语.故选A.
点评 动名词是非谓语动词的一种,在句中可以作主语,宾语,表语等,相当于名词.学习时,要注意区分和掌握.
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