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 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 is some heavy iron in the bottom of this box. It will not fall, because its center of gravity is above its bottom.

【小題1】If the bottom of an object is ______ its top, it will fall over easily.

A．lighter thanB．heavier thanC．no heavier than　　D．a(chǎn)s heavy as
【小題2】Please point out which box will not fall.

【小題3】The main idea of the passage is _________.
A．why things fall over　　　　B．a(chǎn) low center of gravity
C．a(chǎn) high center of gravity　　D．that everything has weight


【小題1】A
【小題2】C
【小題3】A

解析【小題1】根據(jù)文章內(nèi)容If the top of an object is heavier than its bottom, it will fall over easily.可推測(cè)答案為A
【小題2】根據(jù)常識(shí)內(nèi)容可知答案為C
【小題3】根據(jù)文章內(nèi)容大意可知為A

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