单项选择题

A．screens from
B．screens out
C．screens of
D．screens about
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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.
单项选择题
A．In a bookstore.B．At the camera shop.C．In a hospital.D．At a jewelry store.
A．In a bookstore.
B．At the camera shop.
C．In a hospital.
D．At a jewelry store.
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