单项选择题

Such problem （）air, water, and noise pollutions are becoming more and more serious in some big cities.

A.like
B.as
C.of
D.about

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单项选择题
I really hope that you will （）your trip to Canada and get back as soon as possible when people have to knowledge of the law.

A.prefer
B.refer
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A.highly
B.fully
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A.rise
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A.to
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A.by all means
B.by any means
C.by every means
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A.with
B.by
C.for
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A.set out
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C.make out
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A.strange
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D.lonely
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A.insisted
B.persisted
C.existed
D.resized
单项选择题
The（）into the fire accident was carried out by two policemen.

A.question
B.doubt
C.investigation
D.information
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