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.
【C14】

选项 A、Besides
B、Instead
C、Therefore
D、Yet

答案D

解析 本题考查连词用法。根据上下文意思,此处应为转折,besides“而且”;instead“而不是”;therefore“因此”;yet“然而”。故选D。
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