单项选择题

The second paragraph is mainly about______

A．the origin of acid rain
B．the cause of acid rain
C．the formation .of acid rain
D．the widespread damage of acid rain
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单项选择题
Why is acid rain little understood______
A．Because it is a new phenomenon
B．Because it is not frequent enough
C．Because its formation is complex
D．Because it is difficult to study it
单项选择题
From the first sentence of the passage, we learn that______
A．acid rain has caused air pollution
B．acid rain has caused widespread environmental damage
C．acid, rain has become a much studied subject
D．acid rain travels in all directions before it rains down
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