单项选择题

What does this passage mainly talk about

A．The greenhouse effect.
B．The burning of fossil fuels.
C．The potential effect of air pollution.
D．The likelihood of a new ice age.

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高校扩招是一件好事；2．高校扩招可能会带来的一些问题；3．我的观点。Colleges Have Opened Their Doors Wider