单项选择题

To prevent flooding in winter the water flowing from the dam is constantly ________ by a com- puter.

A．graded
B．managed
C．conducted
D．monitored
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单项选择题
He couldn't have meant it ________ He must have been pulling your leg.
A．seriously
B．repeatedly
C．properly
D．jolly
单项选择题
A．repiaced forB．replaced byC．substituted forD．substituted with
A．repiaced for
B．replaced by
C．substituted for
D．substituted with
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