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
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
单项选择题
The word issue in the last paragraph can be replaced as ______.
A．organ
B．topic
C．publication
D．result
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