单项选择题

He is very rich, ______ he is unhappy.

A．and
B．but
C．or
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单项选择题
The twins corrected the mistakes on the test papers ______.
A．them
B．themselves
C．him
单项选择题
______ trees are cut down in the forests every year.
A．Thousands
B．Thousands of
C．Thousand of
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