单项选择题

The ship"s generator broke down, and the pumps had to be operated ______ instead of mechanically.

A．artificially
B．automatically
C．manually
D．synthetically
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This is what you should bear in mind: Don t ______ a salary increase before you actually get it.
A．hang on
B．draw on
C．wait on
D．count on
单项选择题
Salaries for ______ positions seem to be higher than for permanent ones.
A．legal
B．optional
C．voluntary
D．temporary
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