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
It is not too late, but ______ action is needed.
A．right
B．urgent
C．hurry
D．prompt
单项选择题
The Great Wall is a great tourist ______, drawing millions of visitors from all parts of the world every year.
A．attention
B．appointment
C．attraction
D．interest
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