单项选择题

轨道车管理工作应贯彻“安全第一、预防为主、养修并重、服务生产”的（）。

A.原则
B.方针
C.管理

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单项选择题

听力原文：M: It' s high time we raised people' s awareness of noise pollution.
W: I can' t agree with you more. Many psychological as well as physical problems are caused by noise pollution.
What's the woman' s opinion?
A．Many people were killed by noise pollution.
B．She doesn't agree with the man.
C．We should raise people' s awareness of noise pollution.
D．Noise pollution is not so serious as the psychological problem.

A.
W:
B.
What's
C.Many
D.
B．She
E.
C．We
F.
D．Noise
G.

当产品同时具有消费的非排他性和消费的非竞争性时，下列哪项能够解决这种产品的供给? a．自愿捐赠或自愿行为 b．自利的个人或企业 c．政府供给 d．以上都对
A．
B．
C．
D．

A.自愿捐赠或自愿行为
B.自利的个人或企业
C.政府供给
D.以上都对
A．