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.
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A
difference
B
comparison
C
connection
D
barrier
推荐题目
Having seen the X-ray, the doctor decided to ________ the patient.
#13304
A
operate
B
operate on
C
work
D
work on
As far as I know, the new highway is about______ the former one.
#14090
A
as wide as three times
B
three times the width of
C
longer than twice
D
the width of three times