单项选择题

In the past ten years skyscrapers have developed （）in Chicago and New York City.

A．homogeneously
B．simultaneously
C．spontaneously
D．harmoniously

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单项选择题

If the world is to remain peaceful the utmost effort must be made by nations to limit local （）

A．collisions
B．combats
C．contradictions
D．conflicts

单项选择题

Satellite communications are so up-to-date that even when （）in the middle of the Pacific, businessmen can contact their offices as if they were next door.

A．gliding
B．cruising
C．piloting
D．patrolling

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