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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单项选择题
As an actor he could communicate a whole ______ of emotions.
A．frame
B．range
C．number
D．scale
单项选择题
Science and technology have ______ in important ways to the improvement of agricultural production.
A．attached
B．assisted
C．contributed
D．witnessed
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