单项选择题

The sun will burn you ______ you' re not careful.

A．if
B．and
C．but
D．unless
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单项选择题
There are some more topics to discuss, ______ the problem of pollution.
A．generally
B．especially
C．exactly
D．probably
单项选择题
The house is _____ for us to _____.
A．enough big; live
B．enough big; live in
C．big enough; live in
D．big enough; live
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