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  3. How many things can you see in the night sky? A lot! On a clear night you might see the Moon, some planets, and thousands of spa

How many things can you see in the night sky? A lot! On a clear night you might see the Moon, some planets, and thousands of spa

admin2012-12-31  72
问题     How many things can you see in the night sky? A lot! On a clear night you might see the Moon, some planets, and thousands of sparkling stars. You can see even more with a telescope.
    But scientists believe there are some things in the sky that we will never see. We won’t see them with the biggest telescope in the world, on the clearest night of the year. That’s because they’re invisible. They’re the mysterious dead stars called black holes.
    As a star’s gases burn, they give off light and heat.  But when the gas runs out, the star stops burning and begins to die.
    As the star cools, the outer layers of the star pull in toward the center. The star squashes (挤压) into a smaller and smaller ball. If the star was very small, the star ends up as a cold, dark ball called a black dwarf. If the star was very big, it keeps squashing inward until it’s packed together tighter than anything in the universe.
    Imagine if the Earth were crushed until it was the size of a tiny marble. That’s how tightly this dead star, a black hole, is packed. What pulls the star in toward its center with such power? It’s the same force that pulls you down when you jump--the force called gravity. A black hole is so tightly packed that its gravity sucks in everything--even light. The light from a black hole can never come back to your eyes. That’s why you see nothing but blackness.
    So remember: Scattered in the silent darkness are black holes--the great mystery of space.
Which word has the same meaning with the word "mysterious"?
选项 A、ordinary
B、bright
C、strange
D、common
答案C
解析 第二段最后一句。选项C是正确的。前面讲了这些亡星是肉眼看不见的，可它们又的确存在。所以很神秘，也就不一般了(选项A和B)。之所以叫黑洞是因为它没有光，所以选B也是不正确的。
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