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    Thirty years ago, Lake Ponkapog in Hartwell, New Jersey, was full of life. Many birds and animals lived beside the water, which was full of fish. Now there are few birds, animals, and fish. The lake water is polluted. It is in a colour of dirty brown, and it is filled with strange plants.
    How did this happen? First, we must think about how water gets into Lake Ponkapog. When it rains, water comes into the lake from all around. In the past, there were forests all round Lake Ponkapog, so the rainwater was clean.
    Now there are many homes around the lake. People often use the chemicals (化学制品)in their gardens. They use other chemicals inside their houses for cleaning and killing insects. There are also many businesses. Businesses use chemicals in their machines of shops. Other chemicals fall onto the ground from cars or trucks. When it rains, the rainwater picks up all the chemicals from home and businesses and then carries them into the lake . They pollute the water and kill the animals.
    Boats on the lake are also a problem. Lake Ponkapog is a popular place for motorboats（汽船）. But oil and gas from boats often get into the lake. So more bad chemicals go into the water this way.
    People in Hartwell are worried . They love their lake and want to save it. Will it be possible? A clean lake must have clean rainwater going into it. Clean rainwater is possible only if people are more careful about chemicals at home and at other chemicals on the ground. And they mustn’t use motorboats any more on the lake. All these may change people’s lives. Only then can Lake Ponkapog be a beautiful, clean lake again.
    小题1:In the past, the water in Lake Ponkapog was made clean by ________.
    A．forestsB．rainC．birdsD．fish
    小题2:Chemicals from homes and businesses _________.
    A．are always cleanB．can help the animals
    C．are good for the lake D．get into the rainwater
    小题3:Cleaner rainwater will mean _________ .
    A．more boats on the lakeB．more dirty things in the lake
    C．a cleaner lakeD．a dirty lake
    小题4:To save Lake Ponkapog, people need to ________.
    A．be more careful about chemicals B．use the water
    C．grow fewer plants in the gardens D．use more motorboats on the lake
    小题5:The passage is about ________.
    A．boats on the Lake PankapogB．why the water is dirty in Lake Ponkapog
    C．clean rainwaterD．dirty lakes

    小题1:A
    小题2:D
    小题3:C
    小题4:A
    小题5:B

    试题分析：这篇短文主要讲述了美国新泽西州卡本蓬湖的湖水变脏的原因，并提出了适当的建议。
    小题1:根据第二段In the past, there were forests all round Lake Ponkapog, so the rainwater was clean. 描述，可知选A。
    小题2:根据When it rains, the rainwater picks up all the chemicals from home and businesses and then carries them into the lake 。及上文描述，可知选D。
    小题3:根据When it rains, the rainwater picks up all the chemicals from home and businesses and then carries them into the lake .及下文A clean lake must have clean rainwater going into it.描述，可知更干净的雨水造就更干净的湖泊。故选C。
    小题4:最后一段Clean rainwater is possible only if people are more careful about chemicals at home and at other chemicals on the ground.描述，可知选A。
    小题5:这篇短文主要讲述了美国新泽西州卡本蓬湖的湖水变脏的原因。故选B。
    点评：本文中长句较多，一时很难读懂句子含义，注意多读几遍，不要强求非得理解一词一句的含义，能把握文章大意就行。然后带着问题阅读短文，一般就能顺利找出答题依据。对于不能直接找到根据的问题注意联系上下文，根据短文中心总结出正确答案。
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