单项选择题

The least serious damage caused by acid rain is _________.

A．poisoning of plant roots
B．leaching of heavy metals
C．changing the blood chemistry in
D．corrosion of metal structures
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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
单项选择题
Which of the following is the most primary reason for the formation of acid rain
A．Chemical processes in the atmosphere.
B．Dry gases and particulates.
C．The burning of coal and oil.
D．The prevailing wind.
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