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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单项选择题
______, he does get irritated with her sometimes.
A．As he likes her much
B．Much he likes her though
C．Though much he like her
D．Much as he likes her
单项选择题
______ is generally accepted, economical growth is determined by the smooth development of production.
A．What
B．That
C．It
D．As
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