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  3. It is an unfortunate fact of today’s life that most people are growing up unable to see the stars. The prime night sky exists on

It is an unfortunate fact of today’s life that most people are growing up unable to see the stars. The prime night sky exists on

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问题     It is an unfortunate fact of today’s life that most people are growing up unable to see the stars. The prime night sky exists only【C1】________pictures. This is true not only in cities and suburbs, but also in【C2】________areas. We have lost our view of the stars and【C3】________our nighttime environment as well.
    Such a loss【C4】________be acceptable if light pollution were the inevitable price of progress,【C5】________it is not. Most sky glow is【C6】________. It comes mainly from lighting sources that do little to increase【C7】________safety, security or utility. They produce only glare,【C8】________over one billion dollars annually in the U. S. alone.
   【C9】________science, the impact has been even more dramatic. Scientists require observations of extremely faint objects that can only be【C10】________with advanced devices at sites【C11】________of air pollution and urban sky glow. For example, some images of the objects can【C12】________information about faraway corners of the universe, helping us understand the way in【C13】________our world was actually formed.【C14】________, the light from these objects can be lost at the very end of its【C15】________in the glare of our own sky.
    Reducing light pollution is not difficult. It【C16】________that public officials and citizens be【C17】________ of the problem and act to counter it. As【C18】________, people can help reduce sky glow just by【C19】________lighting only when necessary.
    The stars above us are a【C20】________heritage. We must do our best to preserve it.
【C7】
选项 A、nighttime
B、lifetime
C、peacetime
D、longtime
答案A
解析 本题考查名词词义辨析。由上文说人工白昼是不必要的，下文解释原因，“它们并非是用来增加夜晚安全或照明的，它们只是发出耀眼的光”。nighttime“夜晚”；lifetime“一生”；peacetime“和平时期”；longtime“长时间”。由题意可知A选项正确，故选A。
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