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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单项选择题
Our journey was slow because the train stopped ______ at different villages.
A．unceasingly
B．gradually
C．continuously
D．continually
单项选择题
The younger person's attraction to stereos cannot be explained only ______ familiarity with technology.
A．by means of
B．in terms of
C．in quest of
D．by virtue of
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