单项选择题Such changes can alter the social structure,()people to move.

A.which leading
B.leads
C.which led
D.leading


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1.单项选择题There are many cities()very fast.

A.expanding
B.expands
C.expanded
D.expand

3.单项选择题This growth,()mainly in Southeast Asia and Africa, has dramatic consequences.

A.happens
B.which is happening
C.which happening
D.which happened

7.单项选择题Several languages are likely to die()

A.out
B.down
C.off
D.of

8.单项选择题Heat causes the()of gas.

A.growth
B.increase
C.expansion
D.extension

9.单项选择题He is() at doing this kind of job.

A.imefficient
B.nonefficient
C.unefficient
D.inefficient

10.单项选择题Cycling is a good exercise.(), it doesn't pollute the air.

A.Therefore
B.Moreover
C.But
D.However