单项选择题

There are many cities（）very fast.

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

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

A.driven
B.drives
C.driving
D.drove
单项选择题
The population of the world is growing at a dangerous（）

A.measure
B.rate
C.increase
D.progress
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