45. A. suddenly B. nearly C. generally D. unfortunately

　　46. A. carrying B. holding C. pulling D. improving

　　47. A. imagined

　　B. faced C. placed D. viewed

　　48. A. smile

　　B. laugh C. fun D. interest

　　49. A. came B. lasted C. added D. led

　　50. A. arranged

　　B. cared C. looked

　　D. served

　　第部分：阅读理解（共20小题；每小题2分，满分40分）阅读下列短文，从每题所给的四个选项 (A,B,C和D)中，选出最佳选项。 “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 (单个的) stars are visible to the human eyes 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 with the naked eyes. Those people live far away from the lights of big cities, office buildings, 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 sky. Many cities and towns have passed laws limiting lights at night, making sure enough shine for safety without creating much light pollution.

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