Thousandsofyearsago,itwascommontoseemanystarsinthesk...

问题详情：

    Thousands of years ago, it was common to see many stars in the sky. However, this changed with the 61 (invent) of electricity. Cities have gone 62 (bright), using more lights. And that means most people in urban areas will never see beautiful groups of stars. They will never see a 63 (nature) night sky and never be inspired by it.

    Today, people 64 (surround) by light－ even at night time. Much of this light travels where it shouldn’t be－it creates light pollution. For example, a person can put 65 light outside to shine on his own house. But the light could be so strong that it may also shine on his neighbor’s house. The extra light 66 (shine) on the neighbor’s house is one of light pollution.

    But is all this light 67(real) a big problem? People need light to see, work and drive safely at night. But scientists say that this extra light has proven 68 (effect) on living creatures. One kind of animal influenced by light pollution is birds, 69 travel to a different area to lay eggs, usually at night. But lights from tall buildings can lead them 70 their path.

【回答】

61. invention    hter    ral  surrounded   65.a

ing    ly    ctseffective   h   

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