(2013·高考湖北卷)Carbon dioxide，which makes a________between us and the sun，prevents heat from getting out of the atmosphere easily，so the earth is becoming warmer.
#11928
A
difference
B
comparison
C
connection
D
barrier
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Some people say that Mars should be protected as a wildlife reserve where we do everything possible to avoid pollution, on the _______ that life could exist on it.
#11905
A
assumption
B
arrangement
C
assistance
D
appointment
The students are forbidden，unless they have special passes，________after 11 p.m.
#12593
A
of staying out
B
to stay out
C
staying out
D
stay out
He didn’t selfishly keep for himself the money inherited from his uncle. Instead, he made a ______ contribution to help the community.
#13850
A
commercial
B
generous
C
comparable
D
profitable
My uncle hasn’t been able to quit smoking, but at least he has_________ .
#13567
A
cut out
B
cut down
C
cut up
D
cut off