《新理念英语阅读：初中2年级（第4册）》是上海外语教育出版社引进改编的一套内容丰富、图文并茂、分级清晰、训练目的明确的英语读物。本套书有以下特点：内容丰富：既有青少年感兴趣和热衷的侦探、科幻、探险等读物，又有包罗万象的科普类读物，有效兼顾文学性和科普性，是趣味性与知识性、想象与真实的完美结合。练习精炼：每个故事后都提供配套练习，与中考阅读类题型接轨，是备战中考不可或缺的材料。图画精美：色彩丰富、极具趣味性的插图、照片和漫画在辅助读者阅读的同时，也让读者尽情享受前所未有的视觉盛宴。音频支持：全套读物提供语音纯正、绘声绘色、音效逼真的录音，学生可根据需要在读前或读后训练自己的听力。
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宇宙垃圾、陨星与彗星
地震
电
逃离泥石流
蝗灾
词汇表
答案
In their work on atoms， scientists wondered whatkept the electrons spinning around the nucleus. Theydiscovered that the force of attraction between thepositively charged protons and negatively chargedelectrons keeps the electrons spinning. This madesense to the scientists because they had observed thatpositively charged things and negatively charged thingsare attracted to each other.But， what really interested scientists about electrons isthat they can move between atoms and as a result， createelectricity.Today， scientists and engineers use this knowledge tocome up with ways to get electrons to move betweenatoms to make new and amazing inventions that canmake our lives easier.
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