补充：请注意短语：be clear of sth: 无阻碍、障碍、危险
如：Wait until the road is clear of traffic before crossing.(等到路上没车时再过马路 。)

2．Which of the following statements(叙述) is NOT related to（同 。。。有关） light pollution?
A A haze of light is formed from artificial lights such as streetlights and building lights（阴霾的光是由人造光而形成的，如路灯和建筑物的光）．
B Lights from different sources in the city stream into space and illuminate the night sky来自于不同来源的光进入太空并照亮了夜空．
C The night sky is illuminated by the lights from big glowing cities in the night夜空由晚上大城市发出的光照亮．
D Stargazing（star + gazing观望星星） becomes difficult because there is a layer of haze in the air由于空气中有一层霾，所以观望星星变得困难．
分析：本题的关键词是light pollution,而且按照题目的题号应该在文章的前面，所以从第二段找找看：
If you've ever driven toward a big city at night and seen its glow from a great distance（答案C）, you’ve witnessed（见证、目睹） light pollution．It occurs when light from streetlights，office buildings，signs，and other sources streams into space and illuminates the night sky（答案A,B表述）．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 stargazingdifficult（请注意这句话并不是答案D，他们不同，该句是说：甚至在晚上，许多像纽约这样的大城市所产生的灯光使观望星星变得困难 。）所以，D的表述同光污染没有关联 。


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因为曾经黑暗的乡村地区被光污染了．
B No．Because they Call still see stars in rural areas．
C.Yes．Because rural areas are not a good place for astronomers to study stars因为乡村地区不是一个好的研究星星的地方 。
D. No. Because faint light given off by stars call still be seen on a clear night
分析：题目是说：不断扩大的城市会影响天文学家的工作吗？为什么他会这样认为？
在A答案中我们可以看到线索词：polluted 和lights.所以，根据阅读的规律，只要和线索词有关的答案，多半就是最终答案 。如果大家想检查答案是否正确的话，也可以带着关键词astronomers 去找答案：
Hazy skies also make it far more difficult for astronomers to do their jobs.
通过对句子的分析，排除答案B，D.留下A，C.在接下来的段落中可以对答案加以判断：
Cities are getting larger．Suburbs（郊区） are growing in once dark，rural areas．Light from all this new development is increasingly obscuring(使 。。。变得模糊) the faint （微弱的）light given off by distant stars．And if scientists can't locate（确定 。。。的位置） these objects，they can’t learn more about them．
总结：做阅读理解时大家需要牢牢抓住文章的中心或核心词，只要被选项中有核心内容的出现就可以推测为正确答案！
4. How does light pollution affect wildlife? Which of the following is NOT correct?
A . Animals may go off course due to the attraction of artificial lights
由于受到人造光的吸引，动物们可能偏离航向．
B . Animals might be attracted by artificial lights to go into cities．
动物们可能会受到人造光的吸引而进入城市
C. Artificial lights at night may make migrating birds lose their way．
夜间的人造光可能会使迁徙的鸟类们迷路
D Attracted by artificial lights，birds fly into lighted buildings．
由于受到人造光的吸引，鸟类飞进有光的建筑物里 。
分析：题目是说：光污染是如何影响野生动物？下列哪个说法不正确？
关键词就是wildlife,在最后一段里，可以找到内容：
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”（答案A）．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（破坏性的） influence（答案C）．”Sometimes birds fly into lighted towers（答案D），high rises，and cables from radio and televisioll towers．Experts estimate that millions of birds die this way every year.
所以，答案B并未提到 。


5．Which of the following is closest(最接近的) in meaning（意思） to the title"Light Night，Dark Stars"?
A. The night sky is light colored and stars are black夜空是浅色的而星星是黑色的．

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