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  3. Researchers produced evidence to support what most of us already knew—that a cup of tea is the answer to any crisis. Dr. Mal

Researchers produced evidence to support what most of us already knew—that a cup of tea is the answer to any crisis. Dr. Mal

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问题     Researchers produced evidence to support what most of us already knew—that a cup of tea is the answer to any crisis.
    Dr. Malcolm Cross, a psychologist at City University of London, tested the anxiety levels of a group of people following a【C1】______situation and revealed that even a single cup of tea has a【C2】______calming effect. His team gave 42 volunteers a mental arithmetic exam and【C3】______offered half of them a cup of tea and the other half a glass of water. The water group’s anxiety levels soared【C4】______25 percent compared to before the task,【C5】______the tea group actually reported a four percent reduction in anxiety—despite the difficult test, they were more relaxed than when they started.
    According to a survey carried out for the research, 68 percent of Britons【C6】______tea in a dilemma, making it the nation’s most common response to trouble of【C7】______kind. About 60 percent said the promise of comfort and warmth was the main reason for putting the kettle on. "The【C8】______of making and drinking tea—particularly during times of stress—is at the very【C9】______of British culture," Cross said.
    This study shows that the social psychological【C10】______of tea enhance the effects of its chemical make-up on our bodies and brains.
【C4】
选项 A、on
B、in
C、by
D、at
答案C
解析 根据第二段第三句可知，喝水的那一组人的紧张程度比考前上升了25％，而喝茶那一组的紧张程度却降低了4％，尽管考试很难，但他们的情绪比开始时更放松了。表达上升或下降的幅度用介词“by”，故选C。
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