(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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