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 bee 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.
【小题1】Light pollution usually occurs .A．in citiesB．in the countryC．in wild areasD．in developing countries【小题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.【小题3】The victims affected by the light pollution are .A．childrenB．grownupsC．studentsD．observatoriesA
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(答案→)A
解析：本文主要介绍了光线污染的话题，光线污染主要是因为大城市里光线过度使用。
【小题1】A 细节题。根据文章第一段第一句The idea of light pollution has developed with the increase of lights in cities.说明在大城市里灯光的增加是光线污染的主要原因。故A正确。
【小题2】C 推理题。根据第饿一段第二行In many areas, this light makes it difficult or impossible to observe stars and planets in the night sky.说明在漆黑的夜晚我们可以观察天空。但是在明亮的城市里，我们无法看清天空，故C正确。
【小题3】D 细节题。根据第二段One has bee 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.说明observatories是光线污染的受害者，故D项正确。