【B19】
A. in turn
B. at times
C. by accident
D. in consequence
【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.
微信支付 
支付宝支付