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
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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
单项选择题
With an eighty-hour week and little enjoyment, life must have been very ______ for the nineteenth-century factory workers.
A．hostile
B．anxious
C．tedious
D．obscure
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