B
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.
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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.
34. Box _____________will not fall.
A.
B.
C.
D.![]()
35. 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