单项选择题

Located in Washington D. C. the library of Congress contains an______ array of books on every conceivable subject.

A．extensive
B．impressive
C．obvious
D．insignificant
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单项选择题
You really ought to ______; all these late nights are doing you no good.
A．bring down
B．slow down
C．pull through
D．pass through
单项选择题
His parents began to ______ a small sum of money every month for his college education when he was still a little child.
A．put up
B．lay down
C．set aside
D．place apart
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