Light pollution affects more than our view of the heavens and can harm wildlife. Migrating birds (候鸟) sometimes fly over cities and become confused by the brightness, flying in circles until they drop from exhaustion. Sea turtles need dark beaches for nesting and won’t approach bright lights. Too much light at night may even affect human health. For all these reasons, researchers are working on ways to use lights only when and where they are truly needed. Everyone deserves to look up at the sky.

　　51. Many cities and towns have passed laws limiting lights at night mainly to

　　.

　　A. save the electricity

　　B. make sure of migrating birds’ safety

　　C. let you count the number of stars

　　D. avoid much light pollution

　　52. What does the fourth paragraph mainly talk about?

　　A. The cause of light pollution.

　　B. The way to reduce light pollution.

　　C. The effect of light pollution.

　　D. People’s attitude towards light pollution.

　　53. The underlined word “exhaustion” in the last paragraph means

　　.

　　A. air pollution.

　　B. tiredness

　　C. breath

　　D. brightness

　　54. Which would be the best title for the text?

　　A. Light Pollution

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