单项选择题

A．The purpose of laughter.
B．The cause of laughter and its effects.
C．Why and when people laugh.
D．The origin of laughter.
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单项选择题
A．To the Nile River.B．To the Museum of Natural History.C．To Colorado.D．To Arizona.
A．To the Nile River.
B．To the Museum of Natural History.
C．To Colorado.
D．To Arizona.
单项选择题
A．Because they have a driving license.B．Because they have received special training.C．Because the traffic conditions in London are good.D．Because the traffic system of the city is not very complex.
A．Because they have a driving license.
B．Because they have received special training.
C．Because the traffic conditions in London are good.
D．Because the traffic system of the city is not very complex.
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