单项选择题

After several nuclear disasters, a _________ has raged over the safety of nuclear energy.

A．quarrel
B．suspicion
C．verdict
D．controversy
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单项选择题
The airborne particulates tend to wind up in the Northeast airborne here means.
A．produced by air
B．emerged in the air
C．floating
D．polluting
单项选择题
The damaging effects of acid rain are felt less in the West because _________.
A．Western parts produce much less than a quarter of sulfur oxide emissions
B．Western soils can neutralize the acid
C．Westernly wind spread participants out of the western regions
D．chemical industry is less developed in the western states
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