单项选择题

Some of the advice has been （） as they are quite impracticable.

A．turned out
B．turned on
C．turned in
D．turned down

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单项选择题
IOC members stand for（）.

A．themselves
B．their own country
C．the International Olympic Committee
D．nothing
单项选择题
It is reported that there in no better （） for human's hands.

A．alternative
B．equivalence
C．exchange
D．substitute
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