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17．As the population of the planet increases，so does the number of homes，businesses，parking lots，schools，airports and roadways．All these structures require electricity to be lighted．Humans demand these lights．They want their homes more comfortable and streets safe．The problem is that researchers have found that all this light has a negative effect on humans and wildlife as well，so please take care．
Less than 10 years ago I drove to a less populated section of my town，lay down in the middle of the road and watched an attractive meteor shower（流星雨）．The area was short of buildings and street lights．If I did that today，I wouldn't be able to see the meteor shower，but I would be surely run over by a car．
Nowadays scientists are finding light pollution can be almost as bad as CO2 Pollution．If you have ever taken a flight at night，you must remember the view of colored lights all around--it's beautiful but wasteful．How extensive this phenomenon is around the world!
Additionally，electricity needs to be created，and the process of creating that electricity will cause pollution by giving off greenhouse gases．This affects the air we breathe and our quality of life．
Apart from humans，it has been proved that wildlife is also suffering from light pollution．Thousands of birds die each year when they crash into highly lit buildings，as they are confused which direction they should go in by the light．It has been long known that tiny sea turtles become lost and follow lights on the shore instead of heading towards the sea．
Fortunately，light pollution is one of the easiest sources of pollution that can be corrected without a negative effect．We should not only pay more attention to light pollution，but also reduce light pollution by avoiding using unnecessary lighting．
56．The story given in Paragraph 2 is toD．
    A．describe the past beauty of the town
    B．show the advantage of a smaller population
    C．analyze the changes of lights in town
    D．prove the disadvantage of light pollution
57．The birds and tiny sea turtles die or get lost，becauseD．
    A．they are unable to see clearly at night
    B．their eyes are destroyed by right light
    C．electric lights prevent them from heading
    D．the light created by people misleads them
58．What would be the best title for the passage？B
    A．The Causes of Lights                B．Take care of Light pollution
    C．Ways of Reducing Light Pollution      D．The New Finding on Light．

分析 本文屬于說明文閱讀，作者通過這篇文章向我們介紹了光污染所導致的危害，它導致很多動物因為找不到正確的方向而失去了生命，同時作者讓我們關注光污染，避免使用不必要的照明，以此來減少光污染．

解答 56．D  推理判斷題，根據第二段The area was short of buildings and street lights．If I did that today，I wouldn't be able to see the meteor shower，but I would be surely run over by a car．可知本段的故事是向我們證明了光污染的缺點，故選D．
57．D  細節(jié)理解題，根據倒數第二段Thousands of birds die each year when they crash into highly lit buildings，as they are confused which direction they should go in by the light．It has been long known that tiny sea turtles become lost and follow lights on the shore instead of heading towards the sea．可知小鳥和小烏龜死忘或者迷路是因為人類創(chuàng)造的光誤導了它們，使它們找不到正確的方向，故選D．
58．B  主旨大意題，通讀全文可知本文主要向我們介紹了光污染導致的危害，讓我們關注光污染，避免使用不必要的照明，減少光污染，故選B．

點評 考查學生的細節(jié)理解和推理判斷能力．做細節(jié)理解題時一定要找到文章中的原句，和題干進行比較，再做出正確選擇．在做推理判斷題時不要以個人的主觀想象代替文章的事實，要根據文章事實進行合乎邏輯的推理判斷．

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