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职称英语理工类考试考前每日一练 阅读下面这篇短文，短文后列出了七个句子，请根据短文的内容对每个句子作出判断。如果该句提供的是正确信息，请在答题卡上把A涂黑;如果该句提供的是错误信息，请在答题卡上把B涂黑;如果该句的信息文章中没有提及，请在答题卡上把c涂黑。 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。 | 
