单项选择题

A．Nature has 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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单项选择题
A．withoutB．onC．withD．except
A．without
B．on
C．with
D．except
单项选择题
A．Paul didn’t want to come to the get-together.B．Paul didn’t take part in the get-together because his train was late.C．Paul didn’t take part in the get-together because it was not interesting.D．Paul took part in the get-together and found it was fun.
A．Paul didn’t want to come to the get-together.
B．Paul didn’t take part in the get-together because his train was late.
C．Paul didn’t take part in the get-together because it was not interesting.
D．Paul took part in the get-together and found it was fun.
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