Sir John Sulston got a Nobel Prize for Medicine because he has __. The underlined word "they" (paragraph 5) refers to _

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问题 Sir John Sulston got a Nobel Prize for Medicine because he has ______.
The underlined word "they" (paragraph 5) refers to ______.

选项 A、cell deaths
B、diseases
C、instructions
D、cells

答案B

解析根据最后一段第三句话推测：...damage they do to the body。They是前句提到的 heart attacks and diseases like AIDS，故选B。

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公共英语二级笔试

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