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
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单项选择题
The wind was very ______ yesterday.
A． large
B． strong
C． heavy
单项选择题
There is a glass and a basket on the desk. The glass ______ with milk and the basket ______ of apples.
A． fill; full
B． is filled; is fulled
C． is filled; is full
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