2. 外语
  3. A、All the 55,000 attendants of the research were regular runners. B、On average, runners lived 3 years longer than non-runners. C

A、All the 55,000 attendants of the research were regular runners. B、On average, runners lived 3 years longer than non-runners. C

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问题
选项 A、All the 55,000 attendants of the research were regular runners.
B、On average, runners lived 3 years longer than non-runners.
C、3,400 attendants died of heart disease during the research.
D、All the researchers were professors from Iowa State University.
答案B
解析
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