单项选择题

A．None.
B．Two.
C．Three.
D．More than three.
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单项选择题
A．They should call the fire department.B．The man should go to the party again.C．The man should contact the newspaper.D．The man should seek counseling.
A．They should call the fire department.
B．The man should go to the party again.
C．The man should contact the newspaper.
D．The man should seek counseling.
单项选择题
A．Its chemical elements must be studied.B．Its temperature must be lowered.C．Big spaceships must be built.D．Its atmosphere must be changed.
A．Its chemical elements must be studied.
B．Its temperature must be lowered.
C．Big spaceships must be built.
D．Its atmosphere must be changed.
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