单项选择题

Today his room is ______ as usual.

A． so dirty
B． as dirty
C． more dirty
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单项选择题
Trees take harmful gas from the air, and ______ oxygen (氧气) into the air.
A． let out
B． set off
C． give up
单项选择题
The wind was very ______ yesterday.
A． large
B． strong
C． heavy
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