单项选择题

It’s quite obvious that the aging population in China will cause ______ heavy burden on ______ whole society in the future.

A./; a
B.a; the
C.the; a
D.a; /
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单项选择题
______ Shenzhen you see today is quite ______ different city from what it used to be.
A.The; /
B./; the
C.The; a
D.A; the
单项选择题
The English Channel, also known as CCTV-9, provides ______ English viewers both in China and ______ rest of the world with news and other special programs.
A.a; /
B./; /
C.a; the
D./; the
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