2018届一轮复习北师大版必修2Unit4Cyberspace学案(4) 5页

Unit 4　Cyberspace 现在，中国有一亿六千多万网民，其中66%是青少年。你知道人们上网做什么吗？你能够想象得到没有网络的世界会是什么样子吗？‎ ‎ ‎ Can you imagine a world without the Internet? It's surprising to think about it.‎ Now，China has more than 162 million Internet users，according to the China Internet Network Information Centre.This is the second largest number of users in the world after the United States.Today，66% of Chinese “netizens (网民)” are teenagers.“They spend about thirteen hours every week online，” said Qian Hulin，an Internet expert.Doctor Song in Beijing Xuanwu Hospital said about 14% of Chinese netizens who are teens often lasted over ten hours to play online games.‎ The main reasons why teenagers surf the Net are to search for information，to communicate with others and to have fun.On the Internet，teenagers can find out almost anything.And surfing the Net can help students with their homework and widen their knowledge.‎ Li Dong，a teacher at No.41 Middle School in Shijiazhuang，likes her students to use the Internet.“When we talk in class，students who surf the Net usually know more background information than the others，”she said.‎ In addition，people can use the Internet to write letters or stories，send emails and chat.Many teens keep in touch with their friends online.It is cheaper than phoning somebody far away and also much quicker.‎ ‎1．search for 寻找，搜寻 ‎2．widen v. (使)变宽；(使)扩大 ‎3．background n. 背景 ‎4．keep in touch with... 与……保持联系 ‎1．Which country has the largest number of users in the world?‎ ‎ ‎ ‎2．Why do teenagers surf the Net?‎ ‎ ‎ ‎【答案】　1.The United States.　2.They want to search for information，to communicate with others and to have fun.‎ Section Ⅰ　Warmup & Tomorrow's World—Preparing 根据提示写出下列单词 ‎1．gallery n． 画廊 ‎2．global adj. 全球的，全世界的 ‎3．artificial adj. 人造的 ‎4．climate n. 气候 ‎5．flood n. 洪水，水灾 vt.‎‎& vi. 淹没 ‎6．reality n. 真实，现实 ‎7．affect vt. 影响 ‎8．crime n. 犯罪；罪行 ‎9．criminal n. 罪犯 ‎10．terrorist n. 恐怖分子 ‎11．attack n．& vt. 进攻，攻击 ‎12．crash vt. (汽车，飞机等)撞毁；坠毁 ‎13．offer n．& vt. 提供，提议 ‎14．entertainment n. 娱乐；款待 ‎15．disappear vi. 消失 ‎16．harm vt.& n. 伤害，损害 ‎17．obvious adj. 明显的，显而易见的 看单词 学构词：前缀dis表示“不，否，非”，如：dislike不喜欢；dishonest不诚实的；disagree 不同意；disappoint失望；disadvantage不利条件；disappear从视线中消失；discourage 使失去勇气，劝阻；disabled 残疾的，丧失能力的等。 ‎ 根据提示补全下列短语 ‎1．make up 组成；编造；弥补；化妆 ‎2．come true 变成现实；实现 ‎3．find out 发现，查出，弄清楚 ‎4．in the last thirty years 在最近30年里 ‎5．be optimistic about．.. 对……乐观 ‎6．get into 进入；陷入；染上(坏习惯)‎ ‎7．take immediate action 立即采取行动 ‎8．believe in 信任，信仰 ‎9．as if/though 好像；似乎 ‎10．in chaos 混乱 根据提示补全下列教材原句 ‎1．In the last thirty years，the Internet has grown rapidly.‎ 在过去的三十年里，网络已经迅速地发展起来。‎ ‎2．...it is clear that we are going to see a huge growth in shopping on the Internet.‎ ‎……很显然，我们将会看到网上购物的巨大增长。‎ ‎3．Some experts see our future in virtual reality－the use of computers with sounds and pictures that make you feel as if you are in a real situation.‎ 一些专家用虚拟现实的眼光看未来——是计算机通过声音和图像模拟现实，以使人感到仿佛置身于一个真实的空间。‎ ‎　阅读P8教材课文，选择最佳答案 ‎1. From Paragraph One，we know ．‎ A．the Internet came into the world in 1980s B．more and more computers will be connected to the Internet C．people will lose interest in the Internet someday D．one can have several computers at home ‎2．Some experts are pessimistic about the future.They are worrying that ．‎ A．the growth will slow down B．it will cost people a lot C．the world won't be safe D．computers will take the place of humans ‎3．Peter Anderson thinks ．‎ A．people will be able to work in a virtual world B．television will disappear C．the mail service will disappear D．terrorists may “attack” the world's computers ‎4．Which of the following is NOT mentioned in the passage?‎ A．Shopping in a virtual supermarket.‎ B．Studying in a virtual school.‎ C．Communicating with others by chatting tools.‎ D．Getting all kinds of information from the Internet.‎ ‎【答案】　1－4　BCAC ‎　阅读P8课文，在空白处填入适当的内容(1个单词)或括号内单词的正确形式 The Future of Cyberspace In the last thirty years，the Internet 1. (grow)rapidly，and this growth is 2. (clear)going to continue.‎ Some experts are pessimistic 3. the future.One worry is crime in cyberspace.In the future，terrorists may“attack”the world's computers，cause chaos and make planes and trains crash.‎ However，many people are optimistic about the future of the Internet.Already，users can buy books，find out about holiday 4. (offer)and so on.Angela Rossetto says that in the next few years，‎ it is clear that we are going to see a huge growth in shopping on the Internet.She also believes that，in the future，we 5. (get)entertainment from the Net and 6. television will probably disappear.The mail service may also disappear with the 7. (increase)use of email.‎ Some experts see our future in virtual 8. (real)—the use of computers with sounds and pictures 9. make you feel as if you are in 10. real situation.‎ ‎【答案】　1.has grown　2.clearly　3.about　4.offers　5.will get　6.that　7.increasing　8.reality　9.that　10.a