2. 外语
  3. How far is the sun from the earth? This is a question you have asked yourself since you began asking anything. In fact, for thou

How far is the sun from the earth? This is a question you have asked yourself since you began asking anything. In fact, for thou

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问题     How far is the sun from the earth? This is a question you have asked yourself since you began asking anything. In fact, for thousands of years astronomers【C1】______the same question. But they had no way of getting an exact answer【C2】______the sun was far, far away. Now with the use of radio telescope, they【C3】______give a very exact answer: the sun is 92,956,000 miles away from the earth.
    Can you imagine【C4】______that is?
    The airplane today travels【C5】______a speed of 700 miles an hour. Imagine that you were flying to the sun in this airplane. You could make no stops for rest,【C6】______for gas or oil, because there would be no place for you to stop. You would fly day and night at such a speed. Yet by the time you arrived, fifteen years would【C7】______
    The electric train can travel as fast as 110 miles an hour. If a railway could be built on a sunbeam, it【C8】______take the train nearly 100 years to【C9】______the sun. You would get very, very tired even if you lived【C10】______finish the journey.
    What a long way it is to the sun! Have you ever thought that the sun is as far away from us as that?
【C10】
选项 A、enough long to
B、long enough to
C、enough longer to
D、longer enough to
答案B
解析 enough修饰形容词时一般为后置定语。另外此句无比较参照物，所以这里的形容词long不可以是比较级。所以答案为B)。
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