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.可推測答案為A
【小題2】根據(jù)常識內(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

練習(xí)冊系列答案
相關(guān)習(xí)題

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 bottom

B．the bottom of the tower is not heavier than its top

C．its center of the gravity is still above the line of its bottom

D．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 object

B．The center of the weight is always on the object

C．The center of gravity is not always in the middle of the object

D．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(xué)年江蘇省南通市初三適應(yīng)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(shù)) 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.
Reasons for collecting
1                                                                                                                                      
Tell stories. There is your story and the objects themselves also tell stories.
Teach you many things. ★2__________: about important events, great heroes, or everyday life
                          in the past.
★New objects: today's technology and our way of life.
★3__________: about nature.
4                    5__________ with kids and share your knowledge with them.

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

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(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

查看答案和解析>>

同步練習(xí)冊答案