单项选择题

A．On the side of England.
B．On the side of France.
C．On the side of the United States.
D．On the side of themselves.
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单项选择题
A．The man-made building materials let out dangerous gases inside houses.B．There may be more harmful gases outside houses.C．The flow of air indoors is limited.D．Indoor air pollution can make a person seriously ill.
A．The man-made building materials let out dangerous gases inside houses.
B．There may be more harmful gases outside houses.
C．The flow of air indoors is limited.
D．Indoor air pollution can make a person seriously ill.
单项选择题
China’’s opening-up program might begin with the designating southern cities as special economic zones.
A．Y
B．N
C．NG
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