单项选择题

A．steady
B．in sight
C．clear
D．bigger
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单项选择题
A．screens fromB．screens outC．screens ofD．screens about
A．screens from
B．screens out
C．screens of
D．screens about
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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