单项选择题

The ratio of the work done by the machine ______the work done on it is called the efficiency of the machine.

A．against
B．with
C．to
D．for
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单项选择题
The people at the party were worried about Susan because no one was aware______ she had gone.
A．where that
B．of where
C．the place where
D．the place
单项选择题
People who live in small towns often seem more friendly than those living in______ populated areas.
A．densely
B．intensely
C．abundantly
D．highly
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