题目内容

咖啡因的特征反应是()

A. Vitali反应
B. 绿奎宁(Thalleiaquin)反应
C. Marquis反应
D. 紫脲酸铵反应
E. 双缩脲反应

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Tom seldom goes out. He is so____!

A. angry
B. weak
C. small
D. thin

You are too slim and you have to____weight.

A. put up
B. get on
C. put on
D. go on

Have you done something____today.

A. slow
B. special
C. simple
D. short

Please take this medicine____a day and have a good rest.

A. twice
B. two
C. second
D. twos

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