2. 外语
  3. Light Night, Dark Stars Thousands of people around the globe step outside to gaze at their night sky. On a clear night, with

Light Night, Dark Stars Thousands of people around the globe step outside to gaze at their night sky. On a clear night, with

admin2013-10-25  56
问题                     Light Night, Dark Stars
    Thousands of people around the globe step outside to gaze at their night sky. On a clear night, with no clouds, moonlight, or artificial lights to block the view, people can see more than 14, 000 stars in the sky, says Dennis Ward, an astronomer with the University Corporation for Atmospheric Research(UCAR)in Boulder, Colo. But when people are surrounded by city lights, he says, they’re lucky to see 150 stars.
    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.
    Dust and particles of pollution from factories and industries worsen the effects of 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. "
    Hazy skies also make it far more difficult for astronomers to do their jobs.
    Cities are getting larger. Suburbs are growing in once dark, rural areas. Light from all this new development is increasingly obscuring the faint light given off by distant stars. And if scientists can’t locate these objects, they can’t learn more about them.
    Light pollution doesn’t only affect star visibility. It can harm wildlife too. It’s clear that artificial light can 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 Gauthreaux 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 television towers. Experts estimate that millions of birds die this way every year.
Which of the following statements is NOT related to light pollution?
选项 A、A haze of light is formed from artificial lights such as streetlights and building lights.
B、Lights from different sources 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.
答案D
解析 题意：以下说法哪个与光污染无关?A、B、C三项所述内容均可在第二段中找到。D项所表达的意思不符合原文，因为“a layer of baze in the air”的意思是“空气中有一层薄雾”。故本题选D。
转载请注明原文地址:https://kaotiyun.com/show/uHmd777K
本试题收录于： 职称英语卫生类B级题库职称英语分类
0

职称英语卫生类B级

职称英语

相关试题推荐
随机试题
最新回复(0)