单项选择题

Governments_______

A．deny that industries causes acid rain
B．admit that they are only partly responsible
C．claim that they are the main sources of pollution
D．think that the cause of acid rain needs further study

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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