Unit 5 Section A (3a-3d) 学案 2026-2027学年人教版英语九年级上册

该初中英语导学案聚焦人教版九年级上册Unit 5 "Power of Ideas" Section A（3a-3d），核心围绕"invent"及其派生词（inventor, invention）、重点句型（如"in seconds""have a big effect on""of all time"）展开。课堂导入通过讨论21世纪发明激活兴趣，课前预习词汇与句型搭建基础，课堂探究以阅读对话、图表填空、听力角色扮演、语言点讲解构建知识链，形成从词汇到语用的学习支架。 此导学案亮点显著，词汇派生词练习与即学即练提升语言能力，思维导图与发明讨论活动培养思维品质，听力角色扮演强化语用技能，课堂测评与课后写作任务巩固学习能力。整体设计注重知识迁移与自主学习，符合新课标核心素养要求，助力学生高效掌握重点，提升英语综合运用能力。

AI 生成 Unit 5 Power of Ideas Section A（3a-3d） 学 案 2026-2027学年英语人教版九年级上册 姓 名 班 级 日 期 一、课前预习 （一）词汇预习 请根据音标和中文释义，写出对应的英文单词，并完成填空练习。 序号 音标与词性 中文释义 单词拼写 1 /ɪnˈvent/ v. 发明；编造 【词汇填空】根据句意，用 invent 的适当形式填空。 1. The radio was ________ (invent) by Guglielmo Marconi in the 1890s. 2. Marconi was a great ________ (invent) from Italy. 3. The ________ (invent) of the radio changed the world greatly. 4. Can you ________ (invent) a new game for us to play? （二）重点句型预习 请朗读并翻译下列重点句子。 ① Suddenly, news could be spread around the world in seconds. 翻译：突然间，新闻可以在几秒钟内传遍全世界。 ② In 1901, a radio message was sent across the Atlantic Ocean for the first time. 翻译：1901年，无线电信息第一次被发送穿越大西洋。 ③ It also had a big effect on music. 翻译：它对音乐也有很大的影响。 二、课堂探究 （一）情景导入 Think: What are the greatest inventions of the 21st century? （想一想：21世纪最伟大的发明有哪些？） 21世纪的重要发明： • drone（无人机） • electric car（电动汽车） • smartphone（智能手机） 【讨论】Which of these inventions do you think is the most useful? Why? （你认为这些发明中哪一个最有用？为什么？） ______________________________________________________________________ ______________________________________________________________________ （二）3a 阅读理解 Task: Read the conversation. What does Peter think is the most useful invention of all time? （任务：阅读对话。Peter 认为有史以来最有用的发明是什么？） 【对话全文】 Fu Xing: What do you think is the most useful invention of all time, Peter? Peter: It has to be the radio. Fu Xing: The radio? Why? Peter: Before the radio was invented, information travelled very slowly. The world was made much smaller by the radio. Suddenly, news could be spread around the world in seconds. Fu Xing: Right. Who was the inventor? Peter: An Italian inventor called Guglielmo Marconi. He developed the idea in the 1890s. In 1901, a radio message was sent across the Atlantic Ocean for the first time. Fu Xing: Wow! That was quite a distance at that time. Peter: Yeah. And because of the radio, some other important inventions were developed as well. Fu Xing: Like the television? Peter: That's right. It also had a big effect on music. The radio made it much easier for people to enjoy music from artists around the world. 【阅读理解】根据对话内容，回答下列问题。 1. What does Peter think is the most useful invention of all time? ______________________________________________________________________ 2. Who was the inventor of the radio? ______________________________________________________________________ 3. When was a radio message sent across the Atlantic Ocean for the first time? ______________________________________________________________________ 4. What other invention was developed because of the radio? ______________________________________________________________________ 5. How did the radio affect music? ______________________________________________________________________ ______________________________________________________________________ （三）3b 图表填空 Task: Read again and complete the chart.（任务：再读对话，完成图表。） Invention: the radio（发明：无线电） Who was the inventor? （发明者是谁？） Guglielmo Marconi When was it invented? （何时被发明？） In the 1890s / In 1901 How did it change the world? （它如何改变世界？） • The world was made much smaller by the radio. News could be spread around the world in seconds. • Because of the radio, some other important inventions were developed as well. • The radio made it much easier for people to enjoy music from artists around the world. 【参考答案】上表已填入完整信息。 【解题思路】图表信息全部来源于对话原文：发明者 Guglielmo Marconi；发明时间 in the 1890s，首次跨大西洋发送 in 1901；改变世界的三方面——缩小世界、催生其他发明、便利音乐欣赏。 （四）3c 听力与角色扮演 Task: Listen to the conversation. Pay attention to how the key information is stressed. Then role-play the conversation. （任务：听对话，注意关键信息是如何被重读的，然后角色扮演表演对话。） 【提示】在角色扮演时，注意重读关键信息词。例如： • It has to be the radio.（重读 radio，强调最关键信息） • Suddenly, news could be spread around the world in seconds. （重读 in seconds，强调速度快） • It also had a big effect on music.（重读 big effect，强调影响大） （五）语言点1：of all time 1. "of all time" 意为"有史以来、所有时代中"，用来强调范围，表示"在所有时间/所有事物里最……"。 例句：This is the most useful invention of all time. （这是有史以来最有用的发明。） 2. 关键搭配：必须和形容词/副词的最高级一起使用，用来修饰名词，放在名词后面。 常见结构： • the + 形容词最高级 + 名词 + of all time • one of the + 形容词最高级 + 复数名词 + of all time 【易错提示】of all time 与最高级连用 of all time 必须与形容词/副词的最高级搭配使用，不能单独使用，也不能与比较级连用。 【即学即练】 1. This is ______ invention of all time. A. useful B. more useful C. the most useful D. most useful 2. 翻译句子。屠呦呦是有史以来最伟大的科学家之一。 （六）3d 思维导图 Task: Choose another invention that you think is the most important and make a mind map about it. Then describe it to a partner. （任务：选择另一个你认为最重要的发明，为它制作思维导图，然后向同伴描述它。） 【范文示例】 I think the most important invention of all time is the Internet. It does not have a single inventor, but scientists like Vint Cerf and Bob Kahn helped develop its core technology in the late 1960s, and it became widely used by the public in the 1990s. The Internet has changed the world in many ways. First, it lets information travel around the world in seconds, so people can get news and knowledge much faster than before. Second, it made it possible for other great inventions like smartphones and online shopping to develop. Finally, it has changed how we work, study, and communicate with others, making the world feel much smaller and more connected. 【我的思维导图】请在下方写出你选择的发明及其关键信息。 Invention: ________________ Inventor: ________________ Time: ________________ How it changed the world: ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ （七）语言点2：in seconds 1. "in seconds" 意为"立刻、马上、几秒钟之内"，侧重速度很快、瞬间完成。 2. 句子成分：常在句中作时间状语，多放句末，也可放句首表强调。 句式结构：主语 + 谓语 + 宾语 + in seconds 例：You can look up any information in seconds. 你可以瞬间查到任何信息。 3. in seconds 与 in a second 的比较： • in seconds（复数）：几秒内、顷刻间，泛指速度快。 • in a second（单数）：马上、片刻之后，侧重立刻马上，偏口语。 4. in seconds 与 for seconds 的比较： • in seconds：表示完成某事所需的时间（多长时间内完成）。 • for seconds：表示动作持续的时间长度（持续几秒）。 【判断技巧】in 与 for 的区分 in + 时间段 表示"在……时间内完成"；for + 时间段 表示"持续……时间"。判断关键看动词是否强调完成。 【即学即练】 1. The clever boy worked out the difficult math problem ______. A. in second B. for second C. in seconds D. for seconds 2. 翻译句子。With the Internet, we can get news in seconds. （八）语言点3：have a big effect on 1. 含义：对……有很大的影响。 2. 变体拓展： • have a great effect on（有巨大影响） • have a strong effect on（有强烈影响） • have a bad effect on（对……有不良影响） • have a good effect on（对……有好的影响） • have no effect on（对……毫无影响） 3. 易混词辨析：effect 与 affect • effect（名词）：影响、效果，搭配 have an effect on。 • affect（动词）：影响，句式 sth. affects sb./sth.。 例句：The Internet has a big effect on our life. = The Internet affects our life greatly. 【易错提示】effect 与 affect 词性辨析 effect 是名词，常用于 have an effect on 结构；affect 是动词，直接作谓语。记忆口诀："affect 是动词（a 开头 = action 动作），effect 是名词（e 开头 = end result 结果）"。 【即学即练】 1. Weather has a big effect ______ our mood. A. in B. on C. at D. for 2. 翻译句子。网络对我们的学习有很大的影响。 【课堂小结】 本课知识小结 【重点词汇】invent /ɪnˈvent/ v. 发明；编造（派生词：inventor n. 发明者；invention n. 发明） 【重点句型】 ① Suddenly, news could be spread around the world in seconds. ② In 1901, a radio message was sent across the Atlantic Ocean for the first time. ③ It also had a big effect on music. 【语言点】 1. of all time：有史以来（与最高级连用） 2. in seconds：几秒钟内（强调速度快、瞬间完成） 3. have a big effect on：对……有很大影响（effect 名词 / affect 动词） 三、课堂测评 本部分包含单项选择、词汇填空和翻译句子，请独立完成。 （一）单项选择 1. —Who is the greatest writer ______? —I think Lu Xun is. A. of all time B. in all time C. for all time D. at all time 2. With 5G, we can download a movie ______. A. in second B. in seconds C. for seconds D. for second 3. The new policy has a great effect ______ our daily life. A. in B. on C. at D. to 4. The smartphone is one of ______ inventions of all time. A. useful B. more useful C. the most useful D. most useful （二）词汇填空 根据句意，用括号内所给词的适当形式填空。 1. The telephone was ________ (invent) by Bell in 1876. 2. Marconi was a great ________ (invent) from Italy. 3. Bad weather always ________ (affect) our mood. 4. His new ________ (invent) will help many people. （三）翻译句子 1. 这是有史以来最有用的发明之一。 ______________________________________________________________________ 2. 互联网对我们的学习有很大的影响。 ______________________________________________________________________ 3. 有了智能手机，我们几秒钟内就能查到任何信息。 ______________________________________________________________________ ______________________________________________________________________ 四、课后作业 （一）写作任务 参考 3d 范文，选择一个你认为最重要的发明（如智能手机、互联网、电动汽车等），为它制作思维导图，并写一段 60-80 词的短文描述它。 写作要点： 1. What is the invention?（这个发明是什么？） 2. Who invented it and when?（谁在何时发明的？） 3. How did it change the world?（它如何改变了世界？） 提示：可使用本课所学语言点 of all time, in seconds, have a big effect on。 【我的作文】 ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ （二）记忆巩固 1. 熟记本课重点词汇 invent 及其派生词（inventor, invention）。 2. 熟记重点句型： • Suddenly, news could be spread around the world in seconds. • In 1901, a radio message was sent across the Atlantic Ocean for the first time. • It also had a big effect on music. 3. 熟记三个语言点的用法：of all time, in seconds, have a big effect on。 4. 完成《学案》课堂测评中的错题，并写出错误原因。 学科网（北京）股份有限公司 $AI 生成 Unit 5 Power of Ideas Section A（3a-3d） 学 案 2026-2027学年英语人教版九年级上册 姓 名 班 级 日 期 一、课前预习 （一）词汇预习 请根据音标和中文释义，写出对应的英文单词，并完成填空练习。 序号 音标与词性 中文释义 单词拼写 1 /ɪnˈvent/ v. 发明；编造 【词汇填空】根据句意，用 invent 的适当形式填空。 1. The radio was ________ (invent) by Guglielmo Marconi in the 1890s. 2. Marconi was a great ________ (invent) from Italy. 3. The ________ (invent) of the radio changed the world greatly. 4. Can you ________ (invent) a new game for us to play? 【答案】1. invented 2. inventor 3. invention 4. invent 【解题思路】1) 主语 the radio 是 invent 的承受者，用被动语态 was invented；2) a great 后接名词，表人用 inventor（发明者）；3) The 后接名词，表事物用 invention（发明）；4) can 后接动词原形 invent。 （二）重点句型预习 请朗读并翻译下列重点句子。 ① Suddenly, news could be spread around the world in seconds. 翻译：突然间，新闻可以在几秒钟内传遍全世界。 ② In 1901, a radio message was sent across the Atlantic Ocean for the first time. 翻译：1901年，无线电信息第一次被发送穿越大西洋。 ③ It also had a big effect on music. 翻译：它对音乐也有很大的影响。 二、课堂探究 （一）情景导入 Think: What are the greatest inventions of the 21st century? （想一想：21世纪最伟大的发明有哪些？） 21世纪的重要发明： • drone（无人机） • electric car（电动汽车） • smartphone（智能手机） 【讨论】Which of these inventions do you think is the most useful? Why? （你认为这些发明中哪一个最有用？为什么？） ______________________________________________________________________ ______________________________________________________________________ （二）3a 阅读理解 Task: Read the conversation. What does Peter think is the most useful invention of all time? （任务：阅读对话。Peter 认为有史以来最有用的发明是什么？） 【对话全文】 Fu Xing: What do you think is the most useful invention of all time, Peter? Peter: It has to be the radio. Fu Xing: The radio? Why? Peter: Before the radio was invented, information travelled very slowly. The world was made much smaller by the radio. Suddenly, news could be spread around the world in seconds. Fu Xing: Right. Who was the inventor? Peter: An Italian inventor called Guglielmo Marconi. He developed the idea in the 1890s. In 1901, a radio message was sent across the Atlantic Ocean for the first time. Fu Xing: Wow! That was quite a distance at that time. Peter: Yeah. And because of the radio, some other important inventions were developed as well. Fu Xing: Like the television? Peter: That's right. It also had a big effect on music. The radio made it much easier for people to enjoy music from artists around the world. 【阅读理解】根据对话内容，回答下列问题。 1. What does Peter think is the most useful invention of all time? ______________________________________________________________________ 2. Who was the inventor of the radio? ______________________________________________________________________ 3. When was a radio message sent across the Atlantic Ocean for the first time? ______________________________________________________________________ 4. What other invention was developed because of the radio? ______________________________________________________________________ 5. How did the radio affect music? ______________________________________________________________________ ______________________________________________________________________ 【答案】1. The radio. 2. An Italian inventor called Guglielmo Marconi. 3. In 1901. 4. The television. 5. It made it much easier for people to enjoy music from artists around the world. 【解题思路】根据对话逐题定位：1) Peter 明确说 It has to be the radio；2) Peter 说发明者是 An Italian inventor called Guglielmo Marconi；3) 对话中 In 1901, a radio message was sent across the Atlantic Ocean；4) Fu Xing 问 Like the television?，Peter 回答 That's right；5) Peter 说 The radio made it much easier for people to enjoy music from artists around the world。 （三）3b 图表填空 Task: Read again and complete the chart.（任务：再读对话，完成图表。） Invention: the radio（发明：无线电） Who was the inventor? （发明者是谁？） Guglielmo Marconi When was it invented? （何时被发明？） In the 1890s / In 1901 How did it change the world? （它如何改变世界？） • The world was made much smaller by the radio. News could be spread around the world in seconds. • Because of the radio, some other important inventions were developed as well. • The radio made it much easier for people to enjoy music from artists around the world. 【参考答案】上表已填入完整信息。 【解题思路】图表信息全部来源于对话原文：发明者 Guglielmo Marconi；发明时间 in the 1890s，首次跨大西洋发送 in 1901；改变世界的三方面——缩小世界、催生其他发明、便利音乐欣赏。 （四）3c 听力与角色扮演 Task: Listen to the conversation. Pay attention to how the key information is stressed. Then role-play the conversation. （任务：听对话，注意关键信息是如何被重读的，然后角色扮演表演对话。） 【提示】在角色扮演时，注意重读关键信息词。例如： • It has to be the radio.（重读 radio，强调最关键信息） • Suddenly, news could be spread around the world in seconds. （重读 in seconds，强调速度快） • It also had a big effect on music.（重读 big effect，强调影响大） （五）语言点1：of all time 1. "of all time" 意为"有史以来、所有时代中"，用来强调范围，表示"在所有时间/所有事物里最……"。 例句：This is the most useful invention of all time. （这是有史以来最有用的发明。） 2. 关键搭配：必须和形容词/副词的最高级一起使用，用来修饰名词，放在名词后面。 常见结构： • the + 形容词最高级 + 名词 + of all time • one of the + 形容词最高级 + 复数名词 + of all time 【易错提示】of all time 与最高级连用 of all time 必须与形容词/副词的最高级搭配使用，不能单独使用，也不能与比较级连用。 【即学即练】 1. This is ______ invention of all time. A. useful B. more useful C. the most useful D. most useful 【答案】C 【解题思路】of all time 必须与最高级连用，排除 A（原级）和 B（比较级）；最高级前通常加定冠词 the，排除 D，故选 C。 2. 翻译句子。屠呦呦是有史以来最伟大的科学家之一。 【答案】Tu Youyou is one of the greatest scientists of all time. 【解题思路】"有史以来最……之一"对应结构 one of the + 最高级 + 复数名词 + of all time；"最伟大的科学家"译为 the greatest scientists；"之一"用 one of，故整句译为 Tu Youyou is one of the greatest scientists of all time. （六）3d 思维导图 Task: Choose another invention that you think is the most important and make a mind map about it. Then describe it to a partner. （任务：选择另一个你认为最重要的发明，为它制作思维导图，然后向同伴描述它。） 【范文示例】 I think the most important invention of all time is the Internet. It does not have a single inventor, but scientists like Vint Cerf and Bob Kahn helped develop its core technology in the late 1960s, and it became widely used by the public in the 1990s. The Internet has changed the world in many ways. First, it lets information travel around the world in seconds, so people can get news and knowledge much faster than before. Second, it made it possible for other great inventions like smartphones and online shopping to develop. Finally, it has changed how we work, study, and communicate with others, making the world feel much smaller and more connected. 【我的思维导图】请在下方写出你选择的发明及其关键信息。 Invention: ________________ Inventor: ________________ Time: ________________ How it changed the world: ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ （七）语言点2：in seconds 1. "in seconds" 意为"立刻、马上、几秒钟之内"，侧重速度很快、瞬间完成。 2. 句子成分：常在句中作时间状语，多放句末，也可放句首表强调。 句式结构：主语 + 谓语 + 宾语 + in seconds 例：You can look up any information in seconds. 你可以瞬间查到任何信息。 3. in seconds 与 in a second 的比较： • in seconds（复数）：几秒内、顷刻间，泛指速度快。 • in a second（单数）：马上、片刻之后，侧重立刻马上，偏口语。 4. in seconds 与 for seconds 的比较： • in seconds：表示完成某事所需的时间（多长时间内完成）。 • for seconds：表示动作持续的时间长度（持续几秒）。 【判断技巧】in 与 for 的区分 in + 时间段 表示"在……时间内完成"；for + 时间段 表示"持续……时间"。判断关键看动词是否强调完成。 【即学即练】 1. The clever boy worked out the difficult math problem ______. A. in second B. for second C. in seconds D. for seconds 【答案】C 【解题思路】句意为"聪明的男孩几秒钟内就解出了那道数学难题"，强调完成速度快，用 in seconds（几秒内完成）；A 项 in second 形式错误（second 前需 a）；B、D 项 for 表示持续，不合语境，故选 C。 2. 翻译句子。With the Internet, we can get news in seconds. 【答案】有了互联网，我们几秒钟内就能获取新闻。 【解题思路】in seconds 译为"几秒钟内"，强调速度快；With the Internet 译为"有了互联网"；get news 译为"获取新闻"，故整句译为"有了互联网，我们几秒钟内就能获取新闻"。 （八）语言点3：have a big effect on 1. 含义：对……有很大的影响。 2. 变体拓展： • have a great effect on（有巨大影响） • have a strong effect on（有强烈影响） • have a bad effect on（对……有不良影响） • have a good effect on（对……有好的影响） • have no effect on（对……毫无影响） 3. 易混词辨析：effect 与 affect • effect（名词）：影响、效果，搭配 have an effect on。 • affect（动词）：影响，句式 sth. affects sb./sth.。 例句：The Internet has a big effect on our life. = The Internet affects our life greatly. 【易错提示】effect 与 affect 词性辨析 effect 是名词，常用于 have an effect on 结构；affect 是动词，直接作谓语。记忆口诀："affect 是动词（a 开头 = action 动作），effect 是名词（e 开头 = end result 结果）"。 【即学即练】 1. Weather has a big effect ______ our mood. A. in B. on C. at D. for 【答案】B 【解题思路】have a big effect on 是固定搭配，意为"对……有很大影响"，介词必须用 on，故选 B。 2. 翻译句子。网络对我们的学习有很大的影响。 【答案】The Internet has a big effect on our study. 【解题思路】"对……有很大影响"对应 have a big effect on；"网络"译为 the Internet；"我们的学习"译为 our study，故整句译为 The Internet has a big effect on our study。 【课堂小结】 本课知识小结 【重点词汇】invent /ɪnˈvent/ v. 发明；编造（派生词：inventor n. 发明者；invention n. 发明） 【重点句型】 ① Suddenly, news could be spread around the world in seconds. ② In 1901, a radio message was sent across the Atlantic Ocean for the first time. ③ It also had a big effect on music. 【语言点】 1. of all time：有史以来（与最高级连用） 2. in seconds：几秒钟内（强调速度快、瞬间完成） 3. have a big effect on：对……有很大影响（effect 名词 / affect 动词） 三、课堂测评 本部分包含单项选择、词汇填空和翻译句子，请独立完成。 （一）单项选择 1. —Who is the greatest writer ______? —I think Lu Xun is. A. of all time B. in all time C. for all time D. at all time 【答案】A 【解题思路】of all time 意为"有史以来"，用于最高级 greatest 后表强调范围，是固定搭配，其余介词搭配不存在，故选 A。 2. With 5G, we can download a movie ______. A. in second B. in seconds C. for seconds D. for second 【答案】B 【解题思路】句意为"有了5G，我们几秒钟内就能下载一部电影"，强调完成速度快，用 in seconds（几秒内完成）；for 表示持续，不合语境；in second / for second 形式错误，故选 B。 3. The new policy has a great effect ______ our daily life. A. in B. on C. at D. to 【答案】B 【解题思路】have a great effect on 是固定搭配，意为"对……有巨大影响"，介词必须用 on，故选 B。 4. The smartphone is one of ______ inventions of all time. A. useful B. more useful C. the most useful D. most useful 【答案】C 【解题思路】one of the + 最高级 + 复数名词 是固定结构，意为"最……之一"；最高级前须加 the，故选 C。 （二）词汇填空 根据句意，用括号内所给词的适当形式填空。 1. The telephone was ________ (invent) by Bell in 1876. 2. Marconi was a great ________ (invent) from Italy. 3. Bad weather always ________ (affect) our mood. 4. His new ________ (invent) will help many people. 【答案】1. invented 2. inventor 3. affects 4. invention 【解题思路】1) 主语 the telephone 是承受者，用被动语态 was invented；2) a great 后接名词表人，用 inventor；3) affect 是动词，主语 bad weather 是单数，一般现在时动词加 -s 用 affects；4) His new 后接名词表事物，用 invention。 （三）翻译句子 1. 这是有史以来最有用的发明之一。 ______________________________________________________________________ 2. 互联网对我们的学习有很大的影响。 ______________________________________________________________________ 3. 有了智能手机，我们几秒钟内就能查到任何信息。 ______________________________________________________________________ ______________________________________________________________________ 【答案】1. This is one of the most useful inventions of all time. 2. The Internet has a big effect on our study. 3. With smartphones, we can look up any information in seconds. 【解题思路】1) "最……之一"用 one of the + 最高级 + 复数名词 + of all time；2) "对……有很大影响"用 have a big effect on；3) "几秒钟内"用 in seconds，"查到任何信息"用 look up any information。 四、课后作业 （一）写作任务 参考 3d 范文，选择一个你认为最重要的发明（如智能手机、互联网、电动汽车等），为它制作思维导图，并写一段 60-80 词的短文描述它。 写作要点： 1. What is the invention?（这个发明是什么？） 2. Who invented it and when?（谁在何时发明的？） 3. How did it change the world?（它如何改变了世界？） 提示：可使用本课所学语言点 of all time, in seconds, have a big effect on。 【我的作文】 ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ （二）记忆巩固 1. 熟记本课重点词汇 invent 及其派生词（inventor, invention）。 2. 熟记重点句型： • Suddenly, news could be spread around the world in seconds. • In 1901, a radio message was sent across the Atlantic Ocean for the first time. • It also had a big effect on music. 3. 熟记三个语言点的用法：of all time, in seconds, have a big effect on。 4. 完成《学案》课堂测评中的错题，并写出错误原因。 学科网（北京）股份有限公司 $