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”;peace-time“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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