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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