单项选择题

The （） of medical knowledge is being pushed farther onwards as time goes on.

A. potential
B. multitude
C. frontier
D. leap

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单项选择题
Sometimes you are not content when you finish your speech because you know ______.
A. your speech makes little difference to the audience
B. the audience’s better understanding is more essential to you
C. making good speeches is part of the duties of an engineer
D. the speech-making occasion is not important in the least
单项选择题
The bandits demanded that one of the travelers should stay with them as a （）.

A. humanitarian
B. horn
C. host
D. hostage
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