单项选择题

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

A．stay
B．preserve
C．maintain
D．reserve
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单项选择题
He is a well-trained musician who can perceive very small differences in sound.
A．appreciate
B．understand
C．conceive
D．find
单项选择题
She values the boy as if he were her own son.
A．weighs
B．treats
C．considers
D．cherishes
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