单项选择题

As a _________of fact,talking to a friend is nice, but being alone is also enjoyable.

A.thing
B.business
C.matter
D.affair
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单项选择题
水的臭氧消毒的主要缺点是（ ）。
A.会产生异味
B.没有余量
C.消毒效果不强
D.会产生“三致”物质
单项选择题
They had to put off the match as the_________ was too wet to play on.
A.floor
B.earth
C.ground
D.land
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