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【单选题】
Plants _________carbon dioxide and at the same time _________oxygen．So we may put some in our bedrooms to purify the air．
Plants _________carbon dioxide and at the same time _________oxygen. So we may put some in our bedrooms to purify the air.
A.
take in, give out
B.
take up, give off
C.
take over, give in
D.
take off, give up
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A.
broke down
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broke into
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A.
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A.
that
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which
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around that
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A.
of the
B.
in the
C.
in his
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on his
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A.
should
B.
must
C.
would
D.
shall
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A.
indicated
B.
indicating
C.
to indicate
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indicate
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A.
performed
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performing
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to be performed
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A.
Compared with
B.
Comparing to
C.
Compared by
D.
Comparing with
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A.
go through/ go on
B.
go on/ go over
C.
go over/ go through
D.
go on/ go through
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A.
What a great fun
B.
How fun
C.
funny
D.
What fun