The idea of light pollution has developed with the increase of lights in cities. In many areas, this light makes it difficult or impossible to observe stars and planets in the night sky.
There are a number of reasons why light pollution is important. One has become clear at the Mount Wilson Observatory near Los Angeles, California. Today, light from Los Angeles makes the night sky above Mount Wilson very bright. It is no longer an important reasearch center because of light pollution.
Light pollution threatens to reduce the scientific value of research telescoples in other important observatories. They include Lick Observatory near San Jose, California and Yerkes Observatory near Chicago, Illionis.
Light pollution is the result of wasted energy. Bright light that shines into the sky is not being used to provide light where it is needed on Earth. Poorly designed lighting causes a great deal of light pollution. Lights that are brighter than necessary also cause light pollution.
Most people in America are surprised to find out that they are able to see our own galaxy(星系)，the Milky Way, with their own eyes. But about three­fourths of Americans cannot see the Miky Way because of man­made light.
Objects in the night sky are resources that provide everyone with wonder. But light pollution threatens to prevent those wonderful sights from being seen.
小題1:Light pollution usually occurs________.
A．in citiesB．in the country
C．in wild areasD．in developing countries
小題2:Which of the following is TRUE according to the passage?
A．Mount Wilson Observatory is the most important one in America.
B．Light pollution affects observatories only.
C．In the dark night people can observe the sky clearly.
D．Astronomers can observe the stars clearly by the lights of the cities.
小題3:The victims affected by the light pollution are________.
A．childrenB．grown­upsC．studentsD．observatories

小題1:A
小題2:C
小題3:D

試題分析：本文主要介紹了光線污染的話題，光線污染主要是因為大城市里光線過度使用。
小題1:A 細節(jié)題。根據(jù)文章第一段第一句The idea of light pollution has developed with the increase of lights in cities.說明在大城市里燈光的增加是光線污染的主要原因。故A正確。
小題2:C 推理題。根據(jù)第餓一段第二行In many areas, this light makes it difficult or impossible to observe stars and planets in the night sky.說明在漆黑的夜晚我們可以觀察天空。但是在明亮的城市里，我們無法看清天空，故C正確。
小題3:D 細節(jié)題。根據(jù)第二段One has become clear at the Mount Wilson Observatory near Los Angeles, California. Today, light from Los Angeles makes the night sky above Mount Wilson very bright. It is no longer an important reasearch center because of light pollution.說明observatories是光線污染的受害者，故D項正確。
點評：本文屬于科普類短文，細節(jié)題居多，答題時在文章找到對應的地方，用筆進行標記，這有利于后期有時間檢查時可以立刻找到答案的位置。仔細理解作者所講的意思，再結(jié)合選項，通過排除法和自己對全文的把握，選出正確答案。
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D．You’11 try to improve your skills in reading and writing if you're a clever student．
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