单项选择题

A．A crowded city.
B．A busy airport.
C．A steel factory.
D．An old car park.
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单项选择题
A．They are beneficial for one’s nerves.B．They are good for social occasions.C．They may make people sick.D．They should be used in a limited way.
A．They are beneficial for one’s nerves.
B．They are good for social occasions.
C．They may make people sick.
D．They should be used in a limited way.
单项选择题
A．25 minutes.B．10 minutes.C．24 minutes.D．7 minutes
A．25 minutes.
B．10 minutes.
C．24 minutes.
D．7 minutes
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