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he animal to herB.the elephant had come to look for herC.she missed her new homeD.her parents persuaded her to 参考答案： B the elephant had come to look for her----------------------------------------1Gravitation is the force of attention between——． A.any two objectsB.the s11n and thP earthC.the earth and everything on itD.the sun and the stars 参考答案： A any two objects----------------------------------------2he earth would move away in a straight line if——． A.it has nO its orbit B.the sun didn’t pull itC.the sun does not pull it D.it is bigger 参考答案： B the sun didn’t pull it----------------------------------------3We cannot feel the pull of a book because——． A.the book does not pull the earth at allB.the book itself is not strong enough to pull the earthC.the book is too strong to be pulledD.the pull of the earth is very much greater than that of the book 参考答案： D the pull of the earth is very much greater than that of the book----------------------------------------4Which of the following is not true according to the passage? A.The large objects have stronger pull than the small ones．B.The apples do not fly up into the sky because the air holds them．C.There iS an attraction between the earth and the sun．D.The earth is always trying to move away from the sun． 参考答案： B The apples do not fly up into the sky because the air holds them．----------------------------------------1It was remarkable of man to invent the wheel because——． A.it led to many other inventionsB.man had no use for it thenC.there were no wheels in natureD.all of the above 参考答案： C there were no wheels in nature----------------------------------------2he wheel was probably invented by——． A.the first men on earth B.a gro
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