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

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单项选择题

（） the obvious differences in size and population, the states of America have many things （） common.

A. Although; on
B. Though; in
C. Despite; in
D. Because of; on

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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