军队职称英语真题汇编-DE阅读理解51
题目内容

资料题:When its atoms leave their usual places, we say that an object is( )。

2021-02-19

A.shrinking

B.expanding

C.changing places

D.melting

参考资料

Atoms are all around us.They are the bricks of which everything is made.Many millions of atoms are contained in just one grain of salt, but despite their small size they are very important.The way an everyday object behaves depends on what kinds of atoms are in it and how theyact.For instance, you know that most solid objects melt if they get hot enough.Why is this? It is the eat of the heat an the object's atoms.All atoms move constantly.When they are hot,they move faster.Usually the atoms in an object hold together and give the object is 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 60 that the object loses its shape.Then we say that the abject is melting.
题目答案

试卷相关题目

最新试卷
热门试卷

长理培训客户端 资讯,试题,视频一手掌握

去 App Store 免费下载 iOS 客户端