单项选择题

Corporations and labor unions have ______ great benefits upon their employees and members as well as upon the general public.

A．conferred
B．granted
C．flung
D．submitted
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单项选择题
Researchers discovered that plants infected with a virus give off a gas that ______ disease resistance in neighboring plants.
A．contracts
B．activates
C．maintains
D．prescribe
单项选择题
Crisis would be the right term to describe the ______ in many animal species.
A．minimization
B．restriction
C．descent
D．decline
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