【C7】
A. invisible
B. stressed
C. countless
D. marked
Seat occupation has become a common phenomenon in your university. The library management
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.
【C10】
A. why
B. what
C. how
D. which
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