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    科目： 来源：不详 题型：单选题


    They discovered the cause of the fire accidentally. They discovered it _______.
    A．fortunatelyB．by chanceC．all of a suddenD．on purpose

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    科目： 来源：不详 题型：单选题


    He often read ____ the poor light, which made him near-sighted.
    A．for B．byC．onD．under

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    科目： 来源：不详 题型：单选题


    He first the trees___ half and then ____ four parts.
    A．in; inB．into; intoC．in; intoD．into; in

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    科目： 来源：不详 题型：单选题


    I’m feeling __________ the world, for my parents will take me to Kunming for a holiday.
    A．at top ofB．at the top ofC．on the top ofD．on top of

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    科目： 来源：不详 题型：单选题

          ---What are you busy with ?
    --- We are carrying out a research ____ the causes of cancer.
    A．intoB．ontoC．toD．in

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    科目： 来源：不详 题型：单选题

       They treated her very well _______one of the family members.
    A．likeB．asC．as ifD．seems

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    科目： 来源：不详 题型：单选题

      After he won all the money they treated him ______a king.
    A．likeB．asC．as ifD．seemed

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    科目： 来源：不详 题型：单选题

       – Look! What are those boys doing ______ the table?
    ---Well, they are playing cards.
    A．onB．aroundC．underD．beside

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    科目： 来源：不详 题型：单选题

       –Excuse me, Madame. Is this plane _____take off soon?
    ---Oh, yes. In five minutes.
    A．about toB．starting toC．beginning toD．to

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    科目： 来源：不详 题型：单选题

       Standing on top of the mountain, we watched the sun ____ the horizon.
    A．sink belowB．sinking underC．sinking belowD．sink under

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