Most sky glow is_6_.

发布于 2021-02-22 13:55:33

【单选题】
A inadequate
B invisible
C unpredictable
D unnecessary

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leidengsen 2023-02-22

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这家伙很懒，什么也没写！

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1

This is true not only in cities and suburbs, but aloin2 areas.

2

We have lost our view of the stars and _3_ our nighttime environment as well.

3

Such a loss _4_ be acceptable if light pollution were the inevitable price of progress

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高危险场所灯具光源应急点亮的响应时间不应大于（）s

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, _5_ it is not.

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It comes mainly from lighting sources that do little to increase _7_ safety,security or utility.

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They produce only glare, _8_ over one billion dollars annually in the US alone.

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_9_ science, the impact has been even more dramatic.

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Scientists require observations of extremely faint objects that can only be _10_with advanced

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devices at sites _11_ of air pollution and urban sky glow.

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