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  Atoms are all around us. They are the bricks of which every thing is made. Many millions of atoms of atoms are contained in just one grain of sand, but despite their small size they are very important. The way in which an everyday object behaves depends on what kinds of atoms are in it and how they act.

  For instance, you know that most solid objects melt if they get hot enough. Why is this? It is the effect of the heat on the objects' atoms. All atoms move constantly. When they are hot, they move faster.

  Usually the atoms in an object hold together and give the object its shape. But if the object grows hot, its atoms move so fast that they break the force that usually holds them together. They move out of their usual places so that the object loses its shape. Then we say that the object is melting.

(1)The way in which an object behaves depends on the ______. 

[    ]

Akids of atoms in it    Bnumber of atoms in it

Cway its atoms behave   Dboth a and C

(2)Atoms in an object move ______.

[    ]

Aat all times

Bonly when the object is heated

Cwhenever they grow hot

Dunless the object has melted

(3)Heating an object will affect 

[    ]

Athe movements of its atoms

Bthe speed of its atoms

Cthe shape of its atoms

Dboth A and B

(4)An object holds its shape because its atoms ______. 

[    ]

Ausually hold together

Bmove very fast

Care very hot

Dare not moving

(5)When its atoms leave their usual places we say that an object is ______.

[    ]

Ashrinking       Bexpanding

Cchanging places   Dmelting

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科目:高中英语 来源: 题型:053

语篇理解

语篇理解

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科目:高中英语 来源: 题型:053

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科目:高中英语 来源: 题型:053

语篇理解:

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