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．fewB．a fewC．littleD．a little
A．few
B．a few
C．little
D．a little
单项选择题
A．forB．orC．andD．but
A．for
B．or
C．and
D．but
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