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

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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