A．It will increase the amount of unpleasant odors from vehicles.
B．It will eventually destroy the ozone layer.
C．It will reduce the amount of pollutants in the air.
D．It will reduce the cost of running large vehicles.

15．A．They're B．It's C．Is D．It 点击查看答案

听力原文：W: Hotel rooms along the beach must be really expensive,M: Not now. As far as I know, they are dirt cheap during the off season.Q: What does the man say about hotel rooms?(14)A．They haven't been cleaned.B．There aren't any available.C．They are always expensive,D．They are inexpensive now.

A.
Q:
B.They
C.
B．There
D.
C．They
E.They
F.

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