单项选择题

Expected noises are usually more ______ than unexpected ones of the like magnitude.

A. manageable
B. controllable
C. tolerable
D. perceivable

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单项选择题

The professor can hardly find sufficient grounds ______ his argument in favor of the new theory.

A. which to base on
B. on which to base
C. to base on which
D. which to be based on

单项选择题

Experts say walking is one of the best ways for a person to ______ healthy.

A. preserve
B. stay
C. maintain
D. reserve

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