单项选择题

A．The purpose of laughter.
B．The cause of laughter and its effects.
C．Who and when people laugh.
D．The origins of laughter.
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单项选择题
A．She is not interested in the article.B．She has given the man much trouble.C．She would like to have a copy of the article.D．She doesn’t want to take the trouble to read the article.
A．She is not interested in the article.
B．She has given the man much trouble.
C．She would like to have a copy of the article.
D．She doesn’t want to take the trouble to read the article.
单项选择题
A．untilB．byC．afterD．since
A．until
B．by
C．after
D．since
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