单项选择题

I have got an exam tomorrow, so for ______ reasons I won't go out tonight.

A．direct
B．plain
C．unknown
D．obscure
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单项选择题
The service operates 36 libraries throughout the country, while six ______ libraries specially serve the countryside.
A．mobile
B．shifting
C．drifting
D．rotating
单项选择题
According to this passage, those people disagree with the control of carbon dioxide because
A．they think that carbon is beneficial for plant growth
B．they want to use more fuels that can emit carbon dioxide
C．they think carbon dioxide is not the main reason for global warming
D．they think it will destroy the natural balance of gases in the world
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