入风井和采掘工作面的新鲜风流含尘量不得超过（）mg/m³。

听力原文：W: Can you tell me the least expensive way to get to New York City?M: If you go by bus it's only $ 25. But if you go by train, it's almost twice that much.Q: What does the man mean?(16)A．The train is cheaper than the bus.B．The bus is cheaper than the train.C．There are two buses every day.D．The train is faster than the bus.

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

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听力原文：M: Don't you think John and Jim are telling the truth?W: It doesn't seem likely. It would be hard to write two compositions so much alike unless one of them was copying from the other.Q: What seems to be tile woman's opinion?(18)A．It's hard for John and Jim to write two compositions at a time.B．John and Jim look very much alike in many ways.C．Either John or Jim is cheating on the composition.D．Neither John nor Jim is telling the truth.

A.
Q:
B.It's
C.
B．John
D.
C．Either
E.
D．Neither
F.

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