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

Tony is very disappointed（）the results of the exam.

A. with
B. for
C. toward
D. on

单项选择题

Once the（）contradiction is grasped, all problems will be readily solved.

A. principle
B. principal
C. potential
D. primitive

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