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
Researchers have discovered in recent years that there is a system to the actions almost as consistent and______ as language.
A．comprehensive
B．comprehensible
C．observant
D．conceivable
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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