2. 外语
  3. A、To enhance concentration. B、To calm themselves down. C、To show their impatience. D、To signal lack of interest. A

A、To enhance concentration. B、To calm themselves down. C、To show their impatience. D、To signal lack of interest. A

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问题
选项 A、To enhance concentration.
B、To calm themselves down.
C、To show their impatience.
D、To signal lack of interest.
答案A
解析
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大学英语四级

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