单项选择题

Chemistry is closely ______ with other studies: physics, biology and so on.

A．corresponded
B．concerned
C．correlated
D．cooperated
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单项选择题
Because of a recent obstacle in production, sales have dropped and accordingly profits have ______.
A．declined
B．increased
C．broken
D．maintained
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
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