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into steam for running the plant's turbines, change the steam back into water, then return the
water to the original lake or river. Though this water is no dirtier than when it was taken out, it is
often five to ten degrees above its original temperature. This causes
a change in the environment
which can be as dangerous to, aquatic life as waste 'pollution.
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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