(单选题)

What is the effect of radiation on DNA?

A.At higher radiation doses.

B.DNA becomes garbled and cells die quickly.

C.It does not do anything to

D.A.
D. It causes DNA to become cancerous but will not spread to other parts of body.

参考答案：B

参考解析：

细节理解题。根据文章第五段第二句“At higher radiation doses, DNA becomes garbled and cells die quickly.”可知，较高剂量的辐射会使DNA变得混乱，导致细胞迅速死亡。所以B项正确。A项不是“辐射对DNA的影响”；C项错误，全文都说的是辐射对动植物细胞的影响；根据第五段第三句“Lower doses can cause subtler damage in the form of mutations altering the way that the cell functions—for example, causing it to become cancerous, multiply uncontrollably. ”可知，动物体内的癌细胞会无法控制地繁殖，所以细胞会转移到身体的其他部位，D项后半句与文章相反，故不选。故选B。

知识点：阅读理解四选一英语专业基础知识阅读理解教师招聘-小学英语