题目内容

The phrase "the silent revolution"(Line 6, Paragraph 4)implies that population aging will

A. be a violent process.
B. take the world by surprise.
C. make the world different.
D. happen unnoticed.

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【C10】

A. why
B. what
C. how
D. which

【C12】

A. pass
B. permit
C. allow
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【C11】

A. discarding
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【B10】

A. bet
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C. swear
D. pledge