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.
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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
单项选择题
A．The trees are being cut down.B．He needs more air-conditioning.C．The trees help cool his house.D．The trees are blocking his view.
A．The trees are being cut down.
B．He needs more air-conditioning.
C．The trees help cool his house.
D．The trees are blocking his view.
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