题干

人体甲状腺滤泡上皮细胞具有很强的摄碘能力.临床上常用小剂量的放射性同位素131I治疗某些甲状腺疾病,但大剂量的131I对人体会产生有害影响.积聚在细胞内的131I可能直接(  )

A:插入DNA分子引起插入点后的碱基序列改变

B:替换DNA分子中的某一碱基引起基因突变

C:造成染色体断裂、缺失或易位等染色体结构变异

D:诱发甲状腺滤泡上皮细胞基因突变并遗传给下一代

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答案(点此获取答案解析)

C

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    About 20minutes later, as I was walking upstairs I heard Kevin crying inside the 1. I knocked on the door and asked, “Hey Kev, do you want to talk?” No answer. I tried again, “Hey, why don't you come out of there?” Again, no answer. So I took a stack of(一堆) cards and a pencil and wrote, “If you don't want to 2, we can write notes to each other.”
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