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
It is still not clear what ______ a series of argument between them.
A．contributed
B．marked
C．ignited
D．triggered
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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