Multiple Choice 解析3

●Passage分析

All things are made up of atoms. Atoms are the basic components of matter.An atom has three parts, namely, protons, neutrons and electrons.A proton has a positive charge and is heavier than an electron.An electron, on the other hand, has a negative charge and is lighter than a proton.A neutron does not have an electrical charge and weighs almost the same as protons.Both protons and neutrons comprise the nucleus of atoms, while electrons orbit the nucleus.Aside from being the basic component of matter, another remarkable characteristic of atoms is that they serve as sources of nuclear energy.

Passage3是一篇关于构成物质的最基本的最小粒子——原子（atom）的说明性文章。原子由质子（protons）、中子（neutrons）、电子（electrons）构成，这三种要素各有不同的性质。正确掌握段落中关于专业术语的概念和特征的说明是至关重要的。

●Question　分析与答案

In an atom, where can eIectrons be found?

A. Inside the nucleus of an atom

B. Orbiting the protons

C. Within the nucleus, surrounded by protons

D. Revolving around the nucleus.

Question Point是找出原子内电子（electrons）的位置（where）。在文章的第七句（electrons orbit the nucleus）中可以找出符合的内容。选项D的内容与此一致。需要注意的是文章中用动词orbit（绕轨道运行、盘旋）替换同义词“revolving”。其他A, B，C选项与文章的内容不符，故可以排除。

词汇巩固atom原子　component构成的，成分的　proton质子　neutron中子　eIectron电子　comprise包含，构成nucIeus核，原子核　orbit轨道　remarkabIe显著的，卓越的　nucIear原子核的　revoIve旋转，盘旋