Unit 5 Power of Ideas 知识点讲解2026-2027学年人教版英语九年级上册

该初中英语知识清单围绕“Unit 5 Power of Ideas”主题，系统梳理发明相关词汇、短语及被动语态语法。从Section A的核心词汇（invention, connect等）和短语（bring changes to, be connected to等）入手，过渡到Grammar Focus的被动语态（一般过去时、现在时、情态动词结构），再通过Section B的造纸术等案例深化应用，最后以Vocabulary in Use巩固词汇辨析与运用。 知识链路以“词汇-语法-案例-应用”逻辑递进，每个知识点配重点解析、拓展例句及多样化练习（词性转换、句型转换等）。通过真实发明案例提升语言能力，习题设计引导学生分析被动语态结构培养思维品质，配套练习与拓展例句结合助力学习能力提升，体现“学用结合”的学科特色。

Unit 5 Power of Ideas 知识点讲解 Section A 句子 1 What changes can inventions bring to our lives? 重点词汇 invention n. 发明；invent v. 发明；inventor n. 发明者 bring changes to… 给…… 带来改变 拓展例句 Modern inventions bring great changes to people’s daily lives. 配套练习 词性转换：Edison was a great ____ (invent), he had many great ____ (invent). 翻译：发明给我们的生活带来了巨大变化。________________________________ 句子 2 A mini-camera is connected to Super See to help with reading. 重点短语 be connected to 与…… 相连（被动语态） help with sth. 在某方面提供帮助 拓展例句 Your phone can be connected to the smart watch. 配套练习 句型转换（主动改被动）：People connect a mini-camera to the glasses. A mini-camera ____ ____ ____ the glasses. 翻译：蓝牙可以和手机相连。________________________________ 句子 3 Food is added by Smart Cook itself. A button on Smart Cook should be pressed before cooking. 重点词汇 add v. 添加；press v. 按，压；itself pron. 它自己 被动语态结构：be + 过去分词 拓展例句 Water is added before you cook rice. The red button must be pressed to start the machine. 配套练习 填空：Salt ____ (add) to the soup five minutes ago. 改错：You should press the button. → The button should press before use. ________ 句子 4 Hundreds of kinds of dishes can be made by Smart Cook. 重点短语 hundreds of 数百的；kinds of 各种各样的 can be made by… 可以由…… 制作（情态动词被动语态） 拓展例句 All kinds of toys can be made by the 3D printer. 配套练习 同义句：Smart Cook can make hundreds of kinds of dishes. Hundreds of kinds of dishes ____ ____ ____ by Smart Cook. 翻译：数百种蛋糕可以由这台机器制作。________________________________ 句子 5 The object is designed on the computer. A file is sent to the 3D printer. 重点词汇 design v. 设计；produce v. 生产；create v. 创造；send v. 发送 拓展例句 Many new houses are designed by young engineers. Files are sent to the printer automatically. 配套练习 时态填空（一般现在时被动）：All models ____ (design) on computers. 填空：The document ____ (send) to the 3D printer every day. 句子 6 The file is read by the 3D printer. The object is created by building up plastic. 重点短语 build up 堆叠，堆积；plastic n. 塑料 拓展例句 Small plastic parts are built up to make a toy car. 配套练习 补全句子：这个模型是通过堆叠树脂创造出来的。 The model ____ ____ by ____ ____ resin. 句子 7 It has to be the radio. Before the radio was invented, information travelled very slowly. 重点短语 have to be 一定是；information n. 信息（不可数） 拓展例句 It has to be the most useful invention of all time. Before cars were invented, people travelled on foot. 配套练习 同义转换：I think the radio is the most useful invention. It ____ ____ the radio. 翻译：在电视发明之前，人们靠收音机获取新闻。__________________ 句子 8 The world was made much smaller by the radio. News could be spread around the world in seconds. 重点词汇 spread v. 传播（过去式 / 过去分词 spread）；in seconds 瞬间，几秒之内 拓展例句 Messages are spread quickly through the Internet. 配套练习 主动改被动：The radio made the world much smaller. The world ____ ____ much smaller by the radio. 句子 9 A radio message was sent across the Atlantic Ocean for the first time in 1901. 重点短语 for the first time 第一次；across prep. 横跨 一般过去时被动：was/were + 过去分词 拓展例句 The first plane was flown across the ocean in 1927. 配套练习 时态填空：The first telephone call ____ (send) by Bell in 1876. 翻译：1901 年，第一条无线电信号首次跨越大西洋。________________________________ 句子 10 Because of the radio, some other important inventions were developed as well. 重点短语 because of + 名词 / 短语 因为；as well 也；develop v. 研发，发展 辨析 because + 完整句子；because of + 名词短语 拓展例句 Many new tools were developed because of his hard work. 配套练习 改错：Because he’s clever, so he invented many things. ________ 同义句：Many TVs were developed too. Many TVs were developed ____ ____. Grammar Focus 句子 1 The telephone was invented by Alexander Bell in 1876. 语法点 一般过去时被动语态：主语 + was/were + done + by sb. 拓展例句 Paper was invented by Cai Lun in ancient China. 配套练习 对划线提问：The telephone was invented by Bell. ____ ____ the telephone ____ by? 句子 2 People all over the world are connected to each other through the internet. 语法点 一般现在时被动：am/is/are + done each other 互相；through prep. 通过（媒介） 配套练习 填空：All students ____ (connect) by the online class app. 句子 3 Toys, chairs, tables, and even houses can all be made by the 3D printer. 语法点 情态动词被动语态：can/may/must/should + be + done 配套练习 同义句：We can build small houses with 3D printers. Small houses ____ ____ ____ with 3D printers. 句子 4 The Qinghai-Xizang Railway was completed in 2006. It connects Xining to Lhasa. 重点区分 主动 connect（描述客观事实，一般现在时）；被动 was completed（过去被完成） 拓展短语 connect A to B 把 A 连接到 B 配套练习 填空：The new high-speed rail ____ (connect) two big cities now. It ____ (complete) last year. 句子 5 Creative ideas were needed to solve different problems. Tunnels had to be created instead. 语法点 have to be done 不得不被……；instead 代替 配套练习 改写被动：We had to build tunnels here. Tunnels ____ ____ ____ here. Section B 句子 1 All of these things depend on one invention—— papermaking. 重点短语 depend on 依靠，取决于；papermaking n. 造纸术 拓展例句 Modern culture depends on printing and papermaking. 配套练习 翻译：我们的学习依靠各种发明。________________________________ 句子 2 In ancient China, many different materials were used to write on. 重点词汇 ancient adj. 古代的；material n. 材料；be used to do 被用来做 辨析 used to do 过去常常；be used to doing 习惯于；be used to do 被用来做 配套练习 改错：Bamboo was used to writing in old times. ________ 句子 3 Cai Lun got the idea that bark, certain plants, and old clothes could be used to make paper. 重点从句 that 引导同位语从句；could be done 情态动词过去式被动 拓展例句 He had an idea that waste cloth could be reused. 配套练习 主动改被动：People could use bark to make paper. Bark ____ ____ to make paper. 句子 4 All the ingredients were mixed and boiled in water. Finally, this fibre was dried and pressed to form paper. 重点词汇 ingredient n. 原料；mix v. 混合；boil v. 煮沸；dry v. 烘干；press v. 压制 配套练习 按造纸工序排序短语：dry fibre → boil materials → beat pieces → pour liquid 句子 5 The papermaking technique did not only speed up the development of Chinese culture, but also changed civilizations around the world. 重点句型 not only…but also… 不仅…… 而且……；speed up 加速 拓展例句 The plane not only saved time but also connected different countries. 配套练习 翻译：造纸术不仅加速知识传播，还改变了全世界。________________________________ 句子 6 It first spread to China's neighbouring countries and finally reached Europe through Arabic countries in the 12th century. 重点词汇 spread v. 传播；neighbouring adj. 邻近的；reach v. 抵达 配套练习 时态填空：The skill ____ (spread) to foreign countries hundreds of years ago. 句子 7 An accident led to the invention of sticky notes. To his surprise, he produced a glue that was really weak. 重点短语 lead to 导致；to one’s surprise 令某人惊讶的是；produce v. 生产，制造 拓展例句 Careful research led to many new inventions. 配套练习 翻译：令我惊讶的是，这个意外带来了一项伟大发明。________________________________ 句子 8 The invention of the plane has made our travels around the world much easier and faster. As a result, the world has become a much smaller place. 重点短语 as a result 因此；make sth. + 比较级 使某物更…… 配套练习 同义转换：Planes make travelling faster. Travelling ____ ____ much faster ____ planes. Vocabulary in Use 句子 1 News could travel much more rapidly with inventions like the radio and the television. 词汇辨析 rapidly adv. 快速地；slowly adv. 缓慢地 配套练习 选词填空：With the Internet, information spreads ____ (rapid/rapidly). 句子 2 Fibre made from oil provides a cheap solution to the problem. 重点短语 a solution to …… 的解决办法 配套练习 翻译：这项发明为出行难题提供了解决方案。________________________________ 句子 3 He carried out a public test flight in Oakland City. 短语 carry out 实施，开展；public adj. 公开的（反义词 secret 秘密的） 配套练习 填空：Scientists ____ (carry) out many tests before the invention came out. 句子 4 The glue could stick things, but it could be removed very easily. 词汇 stick v. 粘贴；remove v. 移除，撕掉 配套练习 被动改写：We can remove the paper easily. The paper ____ ____ easily. 学科网（北京）股份有限公司 $