单项选择题

[A] disappointed(失望) [B] worried [C] angry
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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
Use an umbrella to protect yourself ______ the rain.
A． of
B． with
C． from
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