单项选择题

There is little air on ______ moon.

A．
[A] the

B．
[B] a

C．
[C] /

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单项选择题
It's cold outside. Please ______ your coat.
A．
[A] put on

B．
[B] put off

C．
[C] put out
单项选择题
______ English well is very important.
A．
[A] Learn

B．
[B] Learnt

C．
[C] Learning
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