单项选择题

Walking is believed to be one of the best ways for a person to ______ healthy.

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

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单项选择题

Under the agreement, the nuclear warheads will be ______.

A．controlled by Russia
B．controlled by the Black Sea Fleet
C．disassembled in Ukraine
D．disassembled in Russia

单项选择题

______ together and put out the fire.

A．Doctors, nurses and patients
B．Volunteers, policemen and firefighters
C．Firemen, policemen and reporters
D．Firemen, policemen and doctors

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