单项选择题

Gooseneck barnacles attach themselves to objects such as docks and boats.

A．fasten
B．propel
C．limit
D．compare
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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
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
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