2. If you've ever driven toward a big city at night and seen its glow from a great distance, you’ve witnessed light pollution．It occurs when light from streetlights，office buildings，signs，and other sources streams into space and illuminates the night sky．This haze of light makes many stars invisible to people on Earth．Even at night，big cities like New York glow from light pollution, making stargazing difficult 。
3. Dust and particles of pollution from factories and industries worsen the effects ot light pollution．“If one city has a lot more light pollution than another，”Ward says，“that city will suffer the effects of light pollution on a much greater scale．”
4. Hazy skies also make it far more difficult for astronomers to do their jobs.
5. Cities are getting larger．Suburbs are growing in once dark，rural areas．Light from all this new development is increasingly obscuring tile faint light given off by distant stars．And if scientists can't locate these objects，they can’t learn more about them．
6. Light pollution doesn’t only affect star visibility．It can harm wildlife too．It’s clear that artificial light call attract animals，making them go off course”．There’s increasing evidence．For example, that migrating birds use sunsets and sunrises to help find their way, says Sydney Gauthreaus Jr., a scientist at Clemson University in South Carolina．“When light occurs at night,” he says, “it has a very disruptive influence．”Sometimes birds fly into lighted towers，high rises，and cables from radio and televisioll towers．Experts estimate that millions of birds die this way every year.


1. When can people see 14000 stars?
A When they have a fairly good telescope．
B When they are in a large city．
C When the night sky is clear of clouds，moonlight and artificial lights．
D When the night sky is without haze and fog．
2．Which of the following statements is NOT related to light pollution?
A A haze of light formed from artificial lights such as streetlights and building lights．
B Lights from different sources in the city stream into space and illuminate the night sky．
C The night sky is illuminated by the lights from big glowing cities in the night．
D Stargazing becomes difficult because there is a layer of haze in the air．
3.Does the writer think growing cities affect astronomers’work?Why does he think so?
A Yes．Because the once dark rural areas are polluted by lights．
B No．Because they can still see stars in rural areas．
C.Yes．Because rural areas are not a good place for astronomers to study stars 。
D. No. Because faint light given off by stars call still be seen on a clear night
4. How does light pollutiotl affect wildlife? Which of the following is NOT correct?
A . Animals may go off course due to the attraction of artificial lights．
B . Animals might be attracted by artificial lights to go into cities．
C. Artificial lights at night may make migrating birds lose their way．
D Attracted by artificial lights，birds fly into lighted buildings．
5．Which of the following is closest in meaning to the title”Light Night，Dark Stars”?
A. The night sky is light colored and stars are black．
B. Lights appear at night and stars are seen in the dark．
C. Cities lights illunfinate the night sky and make stars invisible．
D City lights at night illuminate stars in the sky．
先理解标题，推测文章内容：Light Night，Dark Stars 。没有生词，明亮的夜晚，昏暗的星空 。只是看题目，还不易推测出文章的主要内容，因此，要快速浏览全文，看能否找到出现频率较高的词或短语，它们有可能就是文章的核心！大家看到了我用黑线标出了出现频率最多的短语：light pollution.所以可以推测文章的内容和光污染有关 。
接下来判断所给5题的题型，我们发现1至4都是细节题，因此只需要找到关键词逐一回答即可 。而第5题是主旨题，而且是最后一题，所以要等文章读完后最后做 。


1. When can people see 14000 stars?
A When they have a fairly good telescope当他们有一个非常不错的望远镜．
B When they are in a large city当他们在大城市时．
C When the night sky is clear of clouds，moonlight and artificial lights当夜空中没有云、月光和人造灯光时．
D When the night sky is without haze and fog当夜空没有阴霾和大雾时．
分析：关键词很容易找14000 stars，在第一段出现了该词：
Thousands of people（数以千计的人） around the globe （世界上）step outside（走出去）to gaze at（凝视） their night sky．On a clear（晴朗的） night，with no clouds, moonlight，or artificial （人造的）lights to block（遮挡、挡住） the view，people can see more than 14,000 stars in the sky(答案C)，says Dennis Ward，an astronomer（天文学家） with the University Corporation for Atmospheric Research(UCAR)in Boulder，Colo．But when people are surrounded (被 。。。包围)by city lights．he says，they’re lucky to see 150 stars．

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