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
Biologists have ascertained that specialized cells convert chemical energy into mechanical energy.
A．determined
B．argued
C．pretended
D．hypothesized
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