单项选择题

Care should be taken to decrease the length of time that one is（）loud continuous noise.

A. subjected to
B. filled with
C. associated with
D. attached to

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单项选择题
The best way（）the principle is to see how it actually works in practice.

A. understood
B. understand
C. understanding
D. to understand
单项选择题
You should do（）investigations on this matter.

A. farther
B. much father
C. more father
D. further
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