完形填空

  If we 1 10 kg meat on the 2 of the earth, the object is 3 . If we could take the object several hundred thousand miles away from the earth, it would reduce the weight. Now let us 4 how this happened.

  We often talk about “up” and “down”, but we know that 5 is “down” for us is “up” 6 someone on the other side of the world. That means our earth is a ball. If we could take 10 kg packet of meat 4,000 miles out from the earth, it would weigh only a quarter of 10 kg.

  Why would things weigh a quarter as much as they 7 at the surface of the earth if we 8 them 4,000 miles out in space? The reason is 9 : All 10 have a natural attraction for all other objects. This is called gravitational attraction. But this power of attraction between two objects gets 11 as they get farther apart. When the meat was at the surface of the earth, it was 4,000 miles from the center. In other words, the radius(半径)of the earth is 4,000 miles. When we took meat 4,000 miles out, it was actually 12 miles from the center, which is 13 the distance. The weight of the object in space is 14 its weight on the earth. When taken far, far into space, it becomes 15 .

[  ]1.A.take B.have C.buy D.weigh

[  ]2.A.ground B.face C.surface D.floor

[  ]3.A.more than 10 kg  B.much more than 10 kg

       C.less than 10 kg  D.much more than 10 kg

[  ]4.A.find    B.talk

       C.discuss  D.discover

[  ]5.A.it B.there C.the object D.what

[  ]6.A.for B.to C.with D.as

[  ]7.A.are B.would C.were D.do

[  ]8.A.took     B.would take

     C.have taken  D.had taken

[  ]9.A.it B.this C.that D.such

[  ]10.A.meat    B.meats

        C.substances  D.objects

[  ]11.A.weaker B.weak C.strong D.stronger

[  ]12.A.less than 8,000 B.8,000

     C.more than 8,000 D.4,000

[  ]13.A.just   B.three times

     C.twice  D.equal to

[  ]14.A.the same as B.as heavy as

   C.heavier than D.not the same as

[  ]15.A.great   B.greater

     C.stronger D.weaker and weaker

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