88 -It is stated In the passage that ---- .
A) thermal pollution is more dangerous than pollution from rubbish or chemicals
B) warm water pollution Is as harmful as thermal pollution
C) hydroelectric plants put dirty water back into the environment
D) thermal pollution occurs when the temperature of a river or lake is raised
E) aquatic life is merely disturbed by thermal pollution
89 -Rubbish, sewage or chemicals ---- .
A) are all part of the natural environment
B) can kill aquatic life when they are thrown into the water
C) are the main cause of warm water pollution
D) are by -products of hydroelectric plants
E) have, on occasions, proved to be beneficial to aquatic life
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