单项选择题

Man may destroy the balance of nature, but from time to time, nature takes a terrible______.

A．attack
B．threat
C．lesson
D．revenge
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单项选择题
The attack of the World Trade Center will leave a ______ impression on those who have witnessed the explosion.
A．long
B．forever
C．lasting
D．lively
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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