There are more than 250,000 rivers in the United States. They cover about 3.5 million miles. The table below shows the ten longest rivers in the United States. Ten Longest US RiversRiverLengthFlows intoMissouri2540 milesMississippi RiverMississippi2340 milesGulf of MexicoYu Kon1980 milesBering SeaRio Grande1900 milesGulf of MexicoSt. Lawrence1900 milesGulf of St. LawrenceArkansas1460 milesMississippi RiverColorado1450 milesGulf of CaliforniaRed1290 milesMississippi RiverBrazos1280 milesGulf of MexicoColumbia1240 milesPacific Ocean 【查看更多】

 

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There are two ________ teaching some ________ English.


  1. A.
    woman teachers; girls students
  2. B.
    women teachers; girls students
  3. C.
    men teachers; boys students
  4. D.
    men teachers; boy students

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From the city to its satellite town _____ only less than one hundred miles


  1. A.
    are
  2. B.
    it is
  3. C.
    there is
  4. D.
    there are

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There are hundreds of islands ________ the coast Fujian, the biggest of ________ is not far from the main land．


  1. A.
    on, which
  2. B.
    off, them
  3. C.
    off, which
  4. D.
    on, them

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________there are a large number of chemical factories, the air is likely to be polluted


  1. A.
    Where
  2. B.
    That　　　　
  3. C.
    Though
  4. D.
    As

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Who says man is alone in trying to ______the problem of air pollution? There are certain moths(蛾) whose color serves to protect them.


  1. A.
    solve
  2. B.
    settle
  3. C.
    have
  4. D.
    meet

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