单项选择题

In America side-walks are only found in town centres.

A． Right.
B． Wrong.
C． Doesn't say.
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单项选择题
[A] disappointed(失望) [B] worried [C] angry
[A] disappointed(失望) [B] worried [C] angry
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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