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第4部分:阅读理解(第31~45题,每题3分,共45分)
下面有3篇短文,每篇短文后有5道题。请根据短文内容,为每题确定1个最佳选项。
第一篇
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 (天文学家) with the University Corporation for Atmospheric Research (UCAR) in Boulder, Colo. But when people are surrounded by city lights, he says, theyre lucky to see 150 stars.
If youve ever driven toward a big city at night and seen its glow from a great distance, youve witnessed light pollution. It occurs when light from streetlights, office (照亮) the night buildings, signs, and other sources streams into space and illuminates ~ sky. This haze (朦胧) 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.
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