he animal to her

B.the elephant had come to look for her

C.she missed her new home

D.her parents persuaded her to

参考答案： B

the elephant had come to look for her

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1Gravitation is the force of attention between——．

A.any two objects

B.the s11n and thP earth

C.the earth and everything on it

D.the sun and the stars

参考答案： A

any two objects

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2he earth would move away in a straight line if——．

A.it has nO its orbit

B.the sun didn’t pull it

C.the sun does not pull it

D.it is bigger

参考答案： B

the sun didn’t pull it

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3We cannot feel the pull of a book because——．

A.the book does not pull the earth at all

B.the book itself is not strong enough to pull the earth

C.the book is too strong to be pulled

D.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

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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．

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1It was remarkable of man to invent the wheel because——．

A.it led to many other inventions

B.man had no use for it then

C.there were no wheels in nature

D.all of the above

参考答案： C

there were no wheels in nature

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2he wheel was probably invented by——．

A.the first men on earth

B.a gro

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