单项选择题

We are convinced ______ the righteousness of our cause.

A. of
B. on
C. over
D. at

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单项选择题

According to the acoustics, continual exposure ______ noise of high intensity would lead to loss of hearing.

A. of
B. with
C. to
D. by

单项选择题

Since the father died a year ago, there has been ______ in the family about the division of the estate.

A. distinctions
B. discord
C. disadvantages
D. disappointment

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