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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

admin2022-05-03  15
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.
【C13】
选项 A、that
B、what
C、when
D、which
答案D
解析 本题考查定语从句的引导词。此引导词要修饰先行词way，前面又有in搭配，应为in which表示一种方式，故选D。
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