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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单项选择题
If you ______ the bottle and cigarettes, you'll be much healthier.
A．take off
B．keep off
C．get off
D．set off
单项选择题
The ship's generator broke down, and the pumps had to be operated ______ instead of mechanically.
A．manually
B．artificially
C．automatically
D．synthetically
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