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 than | B．heavier than | C．no heavier than | D．as heavy as |
| A．why things fall over | B．a low center of gravity |
| C．a high center of gravity | D．that everything has weight |
探究與鞏固河南科學技術出版社系列答案科目：初中英語 來源： 題型：050
閱讀理解
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.
(1) Please point out which box will not fall?
(2) From the passage, we can infer that the Leaning Tower of Pisa does not fall is because_______.
[
]A
．the top of the tower is heavier than its bottomB
．the bottom of the tower is not heavier than its topC
．its center of the gravity is still above the line of its bottomD
．its center of the gravity is not above the line of its bottom(3) If an object has a low center of gravity, _______.
[
]|
A ．it won't fall |
B ．it won't fall easily |
|
C ．it is certain to fall over |
D ．its top must be heavier |
(4) Which of the following is TRUE according to the passage?
[
]A
．The center of the weight is always in the middle of the objectB
．The center of the weight is always on the objectC
．The center of gravity is not always in the middle of the objectD
．The center of the gravity is always high(5) The passage is mainly about _______.
[
]|
A ．why things fall over |
B ．a low center of gravity |
|
C ．a high center of gravity |
D ．that everything has weight |
查看答案和解析>>
科目：初中英語 來源：2011-2012學年江蘇省南通市初三適應性考試英語試卷（解析版） 題型：閱讀理解
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 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.
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
查看答案和解析>>
科目：初中英語 來源：同步題 題型：閱讀理解
| 閱讀理解。 | ||||||||
| Collecting opens new worlds for you, but this is only one of the reasons to collect. Here are some more. Collecting tells stories. There is a story behind every object (物品) in a collection. There is your story: the story of when and where you get each object and what it means to you. The objects themselves also tell stories. If an object is old, it may tell the stories of other people who once owned (擁有) or used it. If it's new, it can tell you a lot about its own time and place. Collecting teaches you many things. Historical (歷史的) objects teach us about important events, great heroes, or everyday life in the past. New objects show today's technology (技術) and our way of life. Plants, animals and stones teach us about nature. Collecting lets you share your knowledge with others. When you show your collection to your family or friends, you teach them new and interesting things. Kids all over the world are collectors, so while you're having fun learning about your collection, you can also make new friends and share your knowledge. | ||||||||
|
查看答案和解析>>
科目：初中英語 來源：江蘇期中題 題型：閱讀理解
查看答案和解析>>
湖北省互聯網違法和不良信息舉報平臺 | 網上有害信息舉報專區 | 電信詐騙舉報專區 | 涉歷史虛無主義有害信息舉報專區 | 涉企侵權舉報專區
違法和不良信息舉報電話：027-86699610 舉報郵箱：58377363@163.com
