单项选择题

To prevent flooding in winter the water flowing from the dam is constantly（）by a computer.

A. graded
B. managed
C. conducted
D. monitored

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The car（）halfway for no reason.

A. broke off
B. broke down
C. broke up
D. broke our
单项选择题
This blue flower is known by（）names in other parts of England.

A. separate
B. various
C. diversified
D. plentiful
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