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B
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barrier
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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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