单项选择题

Unpleasant symptoms can cause the smoker to resume smoking to raise the levels of nicotine in the blood.

A. let down
B. go about
C. drop off
D. return to
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单项选择题
This young man took a law degree with distinction and found a job in a well known law firm.
A. difference
B. perfection
C. separation
D. honor
单项选择题
Differences in culture and values will give rise to conflict of ideas and tastes.
A. outbreak
B. assimilation
C. clash
D. harmony
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