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    阅读理解
         Every object has weight. But the center of its weight is not always in the middle of the object. If the
    top of an object is heavier than its bottom, it will fall over easily. We say that its center of gravity(重力)
    is high. But if the bottom is heavier, it won't fall easily. Then we say that its center of gravity is low.
         Look at the first picture. This empty box must fall over, because its center of gravity (C) is not above
    the line of its bottom (AB).
         Now look at the second picture. There are some heavy things in the bottom of this box. It will not fall,
    because its center of gravity is above its bottom.
    1. Box _____________will not fall..

    2. The main idea of the passage is _________.
    A. why things fall over  
    B. a low center of gravity
    C. a high center of gravity
    D. that everything has weight
    1-2 CA
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