单项选择题

A．8. 5 hours.
B．7. 5 hours.
C．8 hours.
D．9 hours.
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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.
填空题
addition
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