单项选择题

A．They have to bargain on the sale.
B．The TV set is usually on sale.
C．They advertise to sell their TV set.
D．They go to buy a TV set at a bargain price
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单项选择题
A．The Japanese mathematic teachers.B．Both the speaker and his German friend.C．Both Americans and immigrants.D．The son of the speaker’s German friend.
A．The Japanese mathematic teachers.
B．Both the speaker and his German friend.
C．Both Americans and immigrants.
D．The son of the speaker’s German friend.
填空题
According to the author, the development of laughter is based on ______.
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