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      1. 新东方网>大学教育>专四专八>备考辅导>专业八级>改错>正文

        英语专八改错练习(四)

        2014-07-01 17:04

        来源:新东方网整理

        作者:

          【改错练习】
          What is a black hole? Well, it is difficult to answer the question,as the terms we would normally use to describe a scientific phenomenon __1
          are adequate here. Astronomers and scientists think that a black hole is __2
          a region of space which matter has fallen and from which nothing can __3
          escape—not even light. But we can’t see a black hole. A black hole __4
          exerts a strong gravitational pull and yet it has no matter. It is only space—or thus we think. How can this happen? __5
          The theory is that some stars explode when their density increases to a particular point; they “collapse” and sometimes a supernova occurs.
          The collapse of a star may produce a “White Dwarf” of a “neutronstar”—a star which matter is so dense that if continually shrinks by the force of __6
          its own gravity. But if the star is very large, this process of shrinking may be so intense that a black hole results in. Imagine the earth reduced to the __7
          size of a marble, but still having the same masses and a stronger __8
          gravitational pull, and you have some ideas of the force of a black hole. __9
          And no matter near the black hole is sucked in. __10

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