题目内容
阅读理解
In our country, power plants that make electricity are often built on rivers. Cool water that is used in making electricity becomes warm as it runs through the plant. Then the heated water is returned to the river.
When large amounts of warm water are dumped into a river, the river itself is heated. The temperature of the water may be raised only a few degrees. Yet these few degrees can change the animal and plant life in the river. Heat causes a loss of oxygen in the water. Fish no longer do well, and some kinds die. Without enough oxygen, bacteria in the river cannot break down waste matter. The river is no longer clean.
In the coming years, new power plants will be built. Many will be run by nuclear energy. A nuclear power plant heats a river even more than a power plant run by gas, oil, or coal.
In some states, laws are being passed to protect the rivers. Certain rivers will be called “cold-water rivers”. Power plants will not be allowed to raise their temperature above 69F. The temperature of “warm-water rivers” will not be raised above 83 F. Power plants will have to cool the water before they pour into rivers.
1.Water that is used in making electricity ________ .
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2.The story does not say so, but it makes you think that ________ .
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A.fish must have oxygen
B.bacteria must be removed from rivers
C.plants need warm water
D.all the power plants are built on rivers
3.Many power plants will be run by ________ .
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4.Why are laws being passed to protect our rivers?
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A.We must save all the water we can to make electricity.
B.People are catching too many fish in our streams and rivers.
C.Without laws, warm water dumped into rivers could kill the fish.
D.Lawyers can have many jobs to do.
5.On the whole this story is about ________ .
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A.the changes caused by heating rivers
B.how nuclear power plants use electricity
C.why we must build new power plants
D.where we can find dead fish
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