单项选择题

The survey showed that ______ numbers of 15-year-olds were already smoking twenty cigarettes a week.

A．essential
B．steady
C．primary
D．substantial
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单项选择题
Sometimes artists find it hard for their works to win popular ______.
A．welcome
B．applause
C．appetite
D．appreciation
单项选择题
There is a high job mobility among young people as they will ______ work one day and find a new job the next.
A．depart
B．reject
C．quit
D．leave
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