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 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.
【C3】

选项 A、but
B、as
C、because
D、though

答案A

解析 理解推断题。题干大意:如果光污染……,这种损失也是可令人接受的,( )事实并非如此。后半句是对上句的虚拟假设的否定,即后半句的意思与前半句截然相反,要用英语的转折词(but)。从后面意思也可看出,光污染大多是人们滥用光源引起的。
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