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  3. It is an unfortunate fact of today’s life that most people are growing up un

It is an unfortunate fact of today’s life that most people are growing up un

游客2025-03-03  29
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 rural areas. We have lost our view of the stars and【C2】______Our nighttime environment as well.
    Such a loss might be acceptable if light pollution were the inevitable price of progress, 【C3】______it is not. Most sky glow is unnecessary. It comes mainly from lighting sources that do little to increase【C4】______safety, security or utility. They produce only glare, costing Over one billion dollars annually in the U.S. alone.
    【C5】______science, the impact has been even more dramatic. Scientists require observations of extremely faint objects that can only be made with advanced devices at sites【C6】______of air pollution and urban sky glow. For example, some images of the objects can offer information about faraway corners of the universe, helping us understand the way in【C7】______our world was actually formed. Therefore, the light from these objects can be lost at the very end of its【C8】______in the glare of our own sky.
    Reducing light pollution is not difficult. It requires that public officials and citizens be【C9】______of the problem and act to counter it. As individuals, people can help reduce sky glow just by【C10】______lighting only when necessary.
    The stars above us are a priceless heritage. We must do our best to preserve it. [br] 【C6】
选项 A、worthy
B、typical
C、critical
D、free
答案 D
解析 理解推断题。题干大意：科学家需要在( )空气污染及无城区人为白昼的场所……展开观察。就常识而言，空气无污染、周边无亮光是夜间观察太空发光物体的基本条件。因此D项为正确答案。
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