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
Chemistry is closely ______ with other studies, physics, biology and so on.
A．corresponded
B．concerned
C．correlated
D．cooperated
单项选择题
The destruction of rainforests has been ______ as a disaster for the environment.
A．blamed
B．declared
C．condemned
D．appealed
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