职称英语理工类考试考前每日一练
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Light pollution
We usually think of pollution as a harmful waste substance that threatens the air and water.But some people have become concerned about another kind of pollution.It can be everywhere,depending oil the time of day.And it is not thought of as a substance.It is light.
The idea of light pollution has developed with the increase of lights in reties.In many areas,this light makes it difficult or impossible to observe stars and planets in the Hiight sky.In l988,the International DarkSky Associations formed.This organization wants to reduce light pollution in the night sky.It also urges the effective use of electric lighting.
There are a number of reasons why reducing light pollution is important.One has become clear at the Mount Wilson Obsmvatory near Los Angels,California.Mount Wilson Observatory was home to the largest telescopes in the world during the first half of the l900s.
During that period,Los Angeles grew to become one of Americas biggest cities。
Today,light from Los Angeles makes the night sky above Mount Wilson very bright.It is no longer all important research center because of light pollution.
Light pollution threatens to reduce the scientific value of research telescopes in other important observatories.They include Like Observatory near San Jose,California and Yorkers Observatory near Chicago,Illinois.
Light pollution is the result of wasted energy.Bright light,that shines into the sky is nol being used to provide light where.it is needed Oil Earth.Poorly designed lighting causes a great deal of light pollution.Lights that are brighter than necessary also cause light pollution.
Recently,two Italian astronomers and an American environmental scientist created a world map of the night sky。
The map shows that North Ameriea,Western Europe and japan have the greatest amount of light pollution。
Most people in America are surprised to find out,that they are able to see our OWn galaxy,the Milky Way,with their own eyes。But about threefourths of Americans cannot see the Milk),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。
1.According to the passage,the idea of light pollutionhas come with the increase of lights in cities.
A.Right
B.Wrong
C.Not mentioned
2.Light pollution results entirely from the ineffective use of electric lights.
A.Right
B.Wrong
C.Not mentioned
3.Bright light from such big cities as Los Angeles has reduced the scientific value of some important observatories nearby.
A.Right
B.Wrong
C.Not mentioned
4.The Worlds night sky map created by astronomers shows that developed countries cause the largest alnount of light pollution.
A.Right
B.Wrong
C.Not mentioned
5.The last paragraph suggests that tobright a night sky deprives us of opportunities to see natural wonderful sights in the space.
A.Right
B.Wrong
C.Not mentioned
6.Air pollution is as damaging as light pollution.
A.Right
B.Wrong
C.Not mentioned
7.The big cities in China are also suffering from light pollution too.
A.Right
B.Wrong
C.Not mentioned
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