There is no end to the magic within this circle of the world we live in. The greatest magicians today are【C1】______the physicist

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问题     There is no end to the magic within this circle of the world we live in. The greatest magicians today are【C1】______the physicists and chemists, the mathematicians and astronomers: the wise men seeking the answers【C2】______the riddles of earth and universe. But【C3】______of them can tell us how to walk【C4】______a floor, "by the law of gravitation"【C5】______the readiest answer【C6】______that.
    Gravitation is【C7】______the most familiar thing in all the world, and we were all brought【C8】______on the story of Newton and his apple and the law of gravitation.【C9】______physicists have begun to say that gravitation may be【C10】______an illusion. If it is an illusion,【C11】______it is pure magic that【C12】______our feet on the ground and our furniture【C13】______floating off into space. And who cares,【C14】______the magic works and the illusion is【C15】______? It is all a matter of vocabulary【C16】______, for no two scholars have ever agreed【C17】______a definition of magic; but there is no denying【C18】______every time man has finally understood and explained a【C19】______he has ceased to call it magic and called it【C20】______instead.
【C5】

选项 A、used to be
B、is used to
C、has used to
D、used to

答案A

解析 used to be有“常常是”的意思,本句意为“万有引力定律常常是最容易说的回答”。故选A。
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