What is the implied meaning of the underlined sentence above?

　　考点4　猜测指代类 【典例】

　　(2015·浙江高考·C片段)

　　. . . Instead, we are diurnal creatures, with eyes adapted to living in the sun’s light. This is a basic evolutionary fact, even though most of us don’t think of

　　ourselves as diurnal beings. Yet it’s the only way to explain what we’ve done to the night: We’ve engineered it to receive us by filling it with light.

　　The benefits of this kind of engineering come with consequences—called light pollution—whose effects scientists are only now beginning to study. Light pollution is largely the result of bad lighting design, which allows artificial light to shine outward and upward into the sky. Ⅲ-designed lighting washes out the darkness of night and completely changes the light levels—and light rhythms—to which many forms of life, including ourselves, have adapted. Wherever human light spills into the natural world, some aspect of life is affected.

　　. . .

　　Q: What does“it”(Paragraph 1)most probably refer to?

　　A. The night.

　　B. The moon.

　　C. The sky.

　　D. The planet.

　　【解题思路】 速读文章, 找出相关句并找出关键词。 Yet it’s the only way to explain what we’ve done to the night: We’ve engineered it to receive us by filling it with light.

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