题目内容

We all think that the ( ) century will encounter many challenges.

A. twenty-first
B. twentieth-first
C. twenty-one
D. twentieth-one

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( )trees have been planted along the river, so the river never overflows.

A. Two hundreds
B. Hundred of
C. Hundreds of
D. Hundreds

There will be many IE technologies used people’s daily life _ 20 years.

A. in; /
B. in; in
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A. for
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C. in
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Since you are_danger, why not ask_ help?

A. in; for
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C. with; for
D. with; to