单项选择题

Located in Washington, D.C., the Library of Congress contains an imposing array of books on every conceivable subject.

A．history
B．catalog
C．shelf
D．collection
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单项选择题
The Railway Labor Mediation Act of 1926 supported the use of collective bargaining to avert interruption of rail service.
A．avenge
B．prevent
C．endure
D．deny
单项选择题
Winston became quite avaricious in his late life.
A．feeble
B．greedy
C．blatant
D．forgetful
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