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

[  ]1Atake Bhave Cbuy Dweigh

[  ]2Aground Bface Csurface Dfloor

[  ]3Amore than 10 kg  Bmuch more than 10 kg

       Cless than 10 kg  Dmuch more than 10 kg

[  ]4Afind    Btalk

       Cdiscuss  Ddiscover

[  ]5Ait Bthere Cthe object Dwhat

[  ]6Afor Bto Cwith Das

[  ]7Aare Bwould Cwere Ddo

[  ]8Atook     Bwould take

     Chave taken  Dhad taken

[  ]9Ait Bthis Cthat Dsuch

[  ]10Ameat    Bmeats

        Csubstances  Dobjects

[  ]11Aweaker Bweak Cstrong Dstronger

[  ]12Aless than 8,000 B8,000

     Cmore than 8,000 D4,000

[  ]13Ajust   Bthree times

     Ctwice  Dequal to

[  ]14Athe same as Bas heavy as

   Cheavier than Dnot the same as

[  ]15Agreat   Bgreater

     Cstronger Dweaker and weaker

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