(2015·日照模拟)Thousands of years ago__1__，this changed with the invention of __2__．Cities have gone brighterl never see beautiful groups of stars.They will never see a __3__ night sky and never be inspired by it.

　　Today，people are __4__ by light—even at night time.Much of this light __5__ where it shouldn’t be—it creates light __6__．For example__7__ shine on his neighbor’s house.The __8__ light shining on the neighbor’s house is one kind of light pollution.

　　But is all this light really a big __9__？People need light to see！But scientists say that this extra

　　light has proven __10__ on living creatures—animals and humans.One kind of animal __11__ by light pollution is the bird.Many birds travel to a different area of the world to lay eggs，__12__ at night.But lights from tall buildings can __13__ the birds off their natural path.They may also crash into brightly lighted buildings，in danger of losing their __14__．　__15__light pollution too.Light affects some chemicals in people’s bodies.And people who are continually __16__ to light at night have higher rates of health problems.

　　People and animals need light，__17__ they also need darkness.Experts say that people must use light __18__．Only use the amount of light that you __19__ter light.People also can greatly __20__ light pollution by using well－designed lights【解题导语】　本文是说明文。文章介绍了光污染的危害以及应对措施。

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