单项选择题

A．She is the organizer.
B．She is contributing to some part of it.
C．She is heavily promoting.
D．She was a student once.
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单项选择题
A．Nature changed our environment over the years.B．We must avoid wasting resources and polluting our environment.C．Our resources are nearly used up.D．Trips to other planets will help eliminate pollution.
A．Nature changed our environment over the years.
B．We must avoid wasting resources and polluting our environment.
C．Our resources are nearly used up.
D．Trips to other planets will help eliminate pollution.
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barrier
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