【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

【答案】 　　1 将as 改为since或者because 　　在表示原因的连接词中，只有as引导的原因状语从句不能位于主句之后，只能位于句首。 　　2 将adequate 改为inadequate,或者在are后加not 　　从逻辑上分析，因为我们拥有的科学术语“不充足”，所以才无法回答这个问题，所以用否定形式。 　　3 在which 前加into 　　这是一个定语从句，意思是“黑洞是太空中物质可以掉进去的地方”，所以定语从句应该为into which matter has fallen 　　4 将but 改为so 　　上文已提到“连光都无法从黑洞中逃出”，所以我们根本无法看到黑洞。这里应该是因果关系,而不是转折关系。 　　5 将thus改为so 　　这句话的意思是“那只是空间—或者我们认为它只是空间”。so做 think 的宾语，thus 只能做连词，不能做宾语。 　　6 将which 改为whose 　　这个定语从句的意思是“它是一颗星,其密度非常大，由于自身的引力,它在不断地收缩”。matter 属于star 所以关系代词应该用whose 　　7 去掉in 　　result为不及物动词,意为“形成了”，而result in sth. 意为“导致某结果”。 　　8 将masses 改为mass 　　mass 可指“大量的物质”，而the masses特指“劳动群众”，用在此处不妥。 　　9 将ideas 改为idea 　　idea在表达“印象”时，为不可数名词，不可以用复数。 　　10 将no改为any 　　分析便知，任何在黑洞附近的东西都会被吸进去。

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