单项选择题

The doctor tried to do an experiment to find out the（）of the medicine on the mice.

A．cause
B．result
C．reason
D．effect

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单项选择题
Scientists say it may be five or six years （）this medicine is tested on human beings.

A．since
B．before
C．after
D．when
单项选择题
With larger numbers of graduates than ever before, just having a degree will no longer be enough to make you （）in the crowd.

A．stand up
B．stand by
C．stand for
D．stand out
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