单项选择题


Questions 19 to 21 are based on the conversation you have just heard.

A．It isn’t reliable.
B．It needs checking.
C．It is definitely trustworthy.
D．It won’t hurt to try.
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单项选择题
A．The effects of noise on the quality of life.B．The role of air traffic restrictions.C．The production of quieter engines.D．The economic aspects of noise reduction.
A．The effects of noise on the quality of life.
B．The role of air traffic restrictions.
C．The production of quieter engines.
D．The economic aspects of noise reduction.
填空题
If one vehicle stops on a motorway, the result is that ______.
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