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
Some individuals have applied positive thinking either to particular external circumstances or to some particular habits or character defects.
A．used... for... for
B．employed... upon... upon
C．adapted... to... to
D．suited... to... to
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
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