单项选择题

A．Use a good microphone.
B．Use smaller rooms.
C．Remain the same in the volume.
D．Not to shout.
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单项选择题
A．They’re cheaper and simpler to drive.B．They are faster.C．They cause littler air pollution.D．They have a brighter future.
A．They’re cheaper and simpler to drive.
B．They are faster.
C．They cause littler air pollution.
D．They have a brighter future.
单项选择题
A．It can’t be compressed.B．It’s often polluted.C．Its temperature often fluctuates.D．It limits their size.
A．It can’t be compressed.
B．It’s often polluted.
C．Its temperature often fluctuates.
D．It limits their size.
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