相关考题
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单项选择题
Heat causes the（）of gas.
A.growth
B.increase
C.expansion
D.extension -
单项选择题
He is（） at doing this kind of job.
A.imefficient
B.nonefficient
C.unefficient
D.inefficient -
单项选择题
Cycling is a good exercise.（）, it doesn't pollute the air.
A.Therefore
B.Moreover
C.But
D.However
