单项选择题

I'm very grateful for your help and hope that someday I may be able to do some thing for you （）

A. in exchange
B. instead
C. in return
D. in particular

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The population of China （） more than one fifth of the total population in the world.

A. is made up of
B. makes up
C. is made of
D. makes of
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Many students （） get frequent help from her.

A. such as Bush
B. Bush for example
C. as Bush
D. Bush is one of them
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