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
Why is such simplistic advice (Para. 3) impossible to follow
A．No one can stay on the same job for long.
B．No prescription is effective in relieving stress.
C．People have to get married someday.
D．You could be missing opportunities as well.
单项选择题
When is the guided tour of the campus given
A．Only during the first week of classes.
B．Whenever students ask for them.
C．Only in the afternoon.
D．In the afternoon.
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