【单选题】Acid rain is a very serious air and water pollution problem. Many people feel-that it is the most serious pollution problem that we now face. Scientists say that plant and animal life in thousands of ...
A.
It is acknowledged by scientists to be the most serious pollution problem that human beings now face.
B.
Many enered species are on the verge of extinction because of acid rain.
C.
Acid rain is composed of sulfur dioxide and nitrogen oxides mixed with water vapor found in the upper atmosphere.
D.
Acid rain is mostly found in the United States and Canada.