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  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?
【C5】
选项 A、in
B、with .
C、on
D、at
答案D
解析 以某速度前进的表达中。需要介词at来引导，at a／the speed of，所以答案为D)。
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