2. 外语
  3. A、It shows great variance in levels of alertness among volunteers. B、It proves that coffee improves memory and attentiveness. C、

A、It shows great variance in levels of alertness among volunteers. B、It proves that coffee improves memory and attentiveness. C、

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问题
选项 A、It shows great variance in levels of alertness among volunteers.
B、It proves that coffee improves memory and attentiveness.
C、It suggests that caffeine only brings drinkers back up to normal.
D、It indicates that coffee drinking is addictive.
答案C
解析 事实细节题。短文最后明确指出，该研究表明咖啡因只不过使喝咖啡的人回到正常状态而已。
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大学英语六级

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