单项选择题

There are many cities（）very fast.

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

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Civil war or regional conflicts also cause disruption,（）people out of rural areas.

A.drives
B.drove
C.driving
D.driven
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This growth,（）mainly in Southeast Asia and Africa, has dramatic consequences.

A.happens
B.which is happening
C.which happening
D.which happened
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Sixty million people who（）in rural areas are moving to cities every year.

A.lived
B.lives
C.living
D.live
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A.since
B.however
C.moreover
D.consequently
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He is trying to find a new way to（）a living. Which of the following is incorrect.

A.get
B.earn
C.take
D.make
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Several languages are likely to die（）

A.out
B.down
C.off
D.of
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Heat causes the（）of gas.

A.growth
B.increase
C.expansion
D.extension
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He is（） at doing this kind of job.

A.imefficient
B.nonefficient
C.unefficient
D.inefficient
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Cycling is a good exercise.（）, it doesn't pollute the air.

A.Therefore
B.Moreover
C.But
D.However
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Speed limits should lead（） fewer deaths on the roads.

A.to
B.off
C.on
D.in
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