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
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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
单项选择题
According to the passages acid rain _________.
A．adds minerals to the grain
B．travels with the prevailing westernly wind
C．leads to birth defects in fish
D．and its formation have been fully understood
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