单项选择题

The movement of the moon conveniently provided the unit of month, which was ______ from one new moon to the next.

A．measured
B．reckoned
C．judged
D．assessed
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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
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
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