In most situations, light helps us see. But when it comes to looking at the night sky, light is actually a kind of pollution. It prevents our view of some of life’s most striking sights: stars, planets, and even galaxies.

“When I was a little boy, I loved the night sky. I remember looking up and the sky was filled with stars. I became an astronomer because I was amazed by their beauty,” says Robert gent, “Now in most big cities kids can’t see the stars like I did.”

Normally, about 2,500 individual stars are visible to the naked eye without using any special equipment. But because of light pollution, you actually see just 200 to 300 and fewer than a dozen from some cities. Only one in three Americans can see our own galaxy (星系) with the naked eye. Those people live far away from the lights of big cities, office building, and shopping malls.

Fortunately, there’s an inexpensive and useful way. If we shine lights down at the ground instead of up into the sky, and use lower brightness levels, we can save big amounts of energy and keep the beauty of the night skies. Many cities and towns have passed laws limiting lights at night, making sure enough shine for safety without creating much light pollution.

Light pollution affects more than our view of the heavens and can harm wildlife. Migrating (遷移) birds 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 light only when and where they are truly needed. Everyone deserves to look up at the sky.

According to the text, using our naked eyes, ______________.

A. people in remote areas can see more stars than those in big cities

B. over one third Americans can see our own galaxy

C. about one in three Americans in big cities can see our own galaxy

D. Americans can only see 200 to 300 stars

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

A. save the electricity                       B. make sure of cities’ safety

C. let you count the number of stars            D. avoid much light pollution

In how many ways will the light pollution do harm?

A. One         B. Two          C. Three          D. Four

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

A. air pollution     B. tiredness      C. breath        D. brightness

【小題1】A

【小題2】D

【小題3】C

【小題4】B


解析:

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