B Every object has weight. But the center of its weight is not always in the middle of the object. ——青夏教育精英家教网—

摘要：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 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. 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

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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.

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

【小题2】Please point out which box will not fall.

【小题3】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

查看习题详情和答案>>

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.

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

A. lighter than　　 B. heavier than　　 C. no heavier than　　 D. as heavy as

2.Please point out which box will not fall.

3.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

查看习题详情和答案>>

小题1:If the bottom of an object is ______ its top, it will fall over easily.

小题2:Please point out which box will not fall.

小题3: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

查看习题详情和答案>>

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

查看习题详情和答案>>

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（引力）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, lifts empty box must fall over, bemuse 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 at the bottom of this box. It will not fall, because its center of gravity is above its bottom.