单项选择题

If the test taker finds an item to which an answer is not known, it may be ______ to leave it blank and go on with the test.

A．valuable
B．advisable
C．considerable
D．probable
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单项选择题
The audience in the cinema ______ mostly of young people.
A．consisted
B．made
C．composed
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Social evils were fundamentally caused by ______ unequality.
A．economy
B．economic
C．economics
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