单项选择题

As is known to us all，sea water（）salt.

A.includes
B.contains
C.including
D.containing

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单项选择题

He is thought（）a good student.

A.of
B.of as
C.being
D.about to be

单项选择题

Noise,（）, is a kind of pollution.

A.such as
B.take for example
C.like
D.for example

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