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    科目： 来源： 题型：单选题

    There______ a number of natural mysteries in the world that even make scientists ______


    1. A.
      exists; confusing
    2. B.
      are existed; confused
    3. C.
      exist; confused
    4. D.
      exist; confusing

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    科目： 来源： 题型：单选题

    The idea of fish being able to produce electricity strong enough to light a lamp is almost unbelievable, _____ several kinds of fish are really able to do this.


    1. A.
      therefore
    2. B.
      and
    3. C.
      then
    4. D.
      but

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    科目： 来源： 题型：单选题

    Those black clouds are a sure ______ that it’s going to rain.


    1. A.
      thing
    2. B.
      mark
    3. C.
      sign
    4. D.
      one

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    科目： 来源： 题型：单选题

    October 15 th is my birthday, ________ I will never forget.


    1. A.
      when
    2. B.
      that
    3. C.
      what
    4. D.
      which

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    科目： 来源： 题型：单选题

    He got home from work only to find the door ___ and something ____.


    1. A.
      opened, misssed
    2. B.
      opening, losing
    3. C.
      open. lost
    4. D.
      to be opened; to be missed

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    科目： 来源： 题型：单选题

    It was nothing but his ten years of hard work that _______ his success in his research.


    1. A.
      referred to
    2. B.
      applied to
    3. C.
      led to
    4. D.
      appealed to

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    科目： 来源： 题型：单选题

    He spoke English so well that I took _______ for granted that he was an American.


    1. A.
      that
    2. B.
      this
    3. C.
      which
    4. D.
      it

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    科目： 来源： 题型：单选题

    Taking medicine only gives you _______ relief from pain, so I suggest you have an operation.


    1. A.
      flexible
    2. B.
      optional
    3. C.
      temporary
    4. D.
      beneficial

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    科目： 来源： 题型：单选题

    Is this the factory ________ he worked ten years ago?


    1. A.
      that
    2. B.
      which
    3. C.
      where
    4. D.
      the one

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    科目： 来源： 题型：单选题

    When their first child was born, they _________ for three years


    1. A.
      had married
    2. B.
      had been married
    3. C.
      got married
    4. D.
      had got married

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