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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______ is generally accepted, economical growth is determined by the smooth development of production.
A. What
B. That
C. It
D. As
单项选择题
The local health organization is reported ______ twenty-five years ago when Dr. Audon became its first president.
A. to be set up
B. being set up
C. to have been set up
D. having been set up
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