英语八下unit-4《lesson-23-the-internet-good-or-bad》课件2.ppt

1、Lesson 23The InternetGood or Bad?Where do these students live?They live in Africa.With the Internet,we could meet them in seconds.Whats this?Its the South Pole.Its far away from us.But the Internet can even take us there.Every _ has two sides.Everything has two sides(_or _),so is the Internet.coinad

2、vantagesdisadvantagesAdvantages:In many ways the Internet makes our life easy and simple.Spending too much time online is harmful to peoples health.Disadvantages:Disadvantages:It may cause people be less social with family and friendsDisadvantages:Aside from(除此以外除此以外)that,Some people attack the web

3、or steal others personal information,even banking information.So we must use the Internet properly.Read the lesson and write true(T)or false(F).1.People can connect and share information in minutes.()2.The Internet can make our life easier and simpler in many ways.()3.Every coin has three sides.()4.

4、The Internet is a useful tool so we can let it take up all of our time.()FFTFsecondstwocantRead Paragraph 1 and 2 and find out the good things about the Internet.*We can use it to_ and _ information _ _.*In many ways it makes life _ and _.*It helps us get things done_ _.*It _ _the world to us.*It ma

5、kes it _to stay in touch if a friend lives_ _.connectshare more quicklyopens up easy far away easier simpler in secondsRead Paragraph 3 and find out the bad things about the Internet.*Spending _ _ time online is _ to peoples _.*It may even _ them to be _ _with family and friends.*Some people _ the w

6、eb or use it to _ others _ information,even _ information.too much harmful attack steal personal bankingcause less social healthRead Paragraph 4 and give some advice for junior high students.*Dont let the Internet _ _ all of your time.*Use the Internet _ and _.take upproperly carefullyListen to the

7、dialogue and tick the correct answers.1.What are Li Ming and Wang Mei talking about?Their school project.Their homework.2.Why does Wang Mei think the Internet is good?She can chat with her friends easily.She can watch TV programs.3.Li Ming thinks they should use the Internet_.carefully and freely pr

8、operly and carefully Most parents and teachers think it is a bad thing to play computer games.They think it is a waste of time and money.Because of computer games,some students dont care about their study any more.Playing too many computer games is also bad for childrens eyes and health.However,comp

9、uter games can also bring some benefits.They can help people in many ways if people spend proper time on it.Some computer games can improve peoples ability of thinking.They can make people think in different ways.Playing computer games can also help people be familiar with the keyboard.If people are

10、 familiar with the keyboard,they can type fast.More and more people begin to design educational CD-ROM.They hope people can get some knowledge while they are playing computer games.Playing computer gamesAdvantagesDisadvantages*Some computer games can _peoples ability of _.*Playing computer games can

11、 also help people be _with the _and _ fast.*It is a waste of _and _.*Some students dont _ _ their study any more.*It is also bad for childrens _ and _.improvethinkingfamiliarkeyboardtypetimemoneycare about eyes health.Pair Work:*Work in pairs to talk about the list in Lets Do It!No.3.*Ask the pairs

12、to share their answers with class.Discuss.Homework:Write a passage for junior high students and give them some advice about what to do and not do on the Internet.Thank you!21.蔚蓝色的宝库蔚蓝色的宝库（冀教版）六年级科学上册课件（冀教版）六年级科学上册课件猜一猜猜一猜家住大海家住大海,走向岸来走向岸来.太阳一晒太阳一晒,身体变白身体变白.盐盐肚中藏宝，浩瀚无边，入口苦涩，肚中藏宝，浩瀚无边，入口苦涩，性情多变。性情多变。地

13、球表面大部分是蔚蓝地球表面大部分是蔚蓝色的海洋，占地球表面积的色的海洋，占地球表面积的70%70%还多，其中面积还多，其中面积最大最大的是的是太平洋太平洋，面积，面积最小最小的是的是北冰北冰洋洋，我们国家靠着太平洋。，我们国家靠着太平洋。认识美丽的海洋认识美丽的海洋 海洋是生命的摇篮，资源的海洋是生命的摇篮，资源的宝库。对于海洋，我们究竟了宝库。对于海洋，我们究竟了解多少？海洋里有哪些重要的解多少？海洋里有哪些重要的资源呢？让我们一起来揭开蓝资源呢？让我们一起来揭开蓝色海洋的面纱，探索海洋的奥色海洋的面纱，探索海洋的奥秘吧！秘吧！丰富的海洋资源丰富的海洋资源大陆架大陆架一、什么是大陆架？一、什

14、么是大陆架？大陆架是陆地在海中的延续，大陆架是陆地在海中的延续，我国的、我国的、渤海渤海、黄海黄海和和东海东海的大陆的大陆架极其宽阔，其中蕴藏着丰富的架极其宽阔，其中蕴藏着丰富的石石油油和和天然气天然气矿藏。根据估算，我国矿藏。根据估算，我国的海洋的海洋石油储石油储量可达量可达2222亿亿吨吨，天然，天然气储量达气储量达480480亿亿立方米立方米。丰富的海洋资源丰富的海洋资源矿物质矿物质 海水中含有大量的海水中含有大量的矿物质矿物质，最多的物质是最多的物质是盐盐。据计算，如果将。据计算，如果将地球上海水中的盐全部提炼出来，地球上海水中的盐全部提炼出来，均匀地铺撒在地球表面，可铺成一均匀地铺撒

15、在地球表面，可铺成一个约个约4040米厚的盐层。米厚的盐层。丰富的海洋资源丰富的海洋资源砂矿砂矿海上采砂海上采砂砂砂 石石 我国的滨海砂矿储量十分丰富。到我国的滨海砂矿储量十分丰富。到目前，已发现滨海砂矿目前，已发现滨海砂矿2020多多种，各类种，各类砂矿床砂矿床191191个个，总探明储量达，总探明储量达1616亿多亿多吨，吨，矿种达矿种达6060多多种。其中，具有工业价值种。其中，具有工业价值的海砂矿有的海砂矿有1313种种，包括，包括钛铁矿钛铁矿、锆石锆石、金红石金红石、独居石独居石、磷钇矿磷钇矿、磁铁矿磁铁矿和和砂锡砂锡等。等。在独具魅力的蓝色水域中，在独具魅力的蓝色水域中，生活着大量

16、的海洋生物，其中海生活着大量的海洋生物，其中海洋动物洋动物1717万万余种，海洋植物约有余种，海洋植物约有2.52.5万万余种。余种。丰富的海洋资源丰富的海洋资源生物资源生物资源巨鲸巨鲸海星海星乌贼乌贼鹦鹉螺鹦鹉螺夜光鱼夜光鱼海豹海豹海豹海豹海参海参海葵海葵珊瑚珊瑚藻藻 类类 藻藻 类类 1 1、能量资源：、能量资源：潮汐能、波浪能、海流能、海水潮汐能、波浪能、海流能、海水 温差能。温差能。2 2、生物资源：、生物资源：海洋藻类资源、海洋动物资源。海洋藻类资源、海洋动物资源。3 3、矿产资源：、矿产资源：海底石油、天然气、滨海砂矿等。海底石油、天然气、滨海砂矿等。4 4、空间资源：、空间资源：

17、海岸与海岛空间资源、海面与洋海岸与海岛空间资源、海面与洋面空间资源、海洋水层空间资源、海底空间资源面空间资源、海洋水层空间资源、海底空间资源等。等。此外，海水本身也是一种资源，海水中溶解此外，海水本身也是一种资源，海水中溶解的物质资源等。的物质资源等。海洋资源的分类海洋资源的分类 辽阔的海洋蕴藏着丰富的生物辽阔的海洋蕴藏着丰富的生物、矿物、化学、能源等各种自然资、矿物、化学、能源等各种自然资源，堪称是地球上一座巨大的源，堪称是地球上一座巨大的“蓝蓝色资源宝库色资源宝库”。在人类对石油、天。在人类对石油、天然气等不可再生资源的需求越来越然气等不可再生资源的需求越来越大的情况下，海底石油、天然气成大的情况下，海底石油、天然气成了海洋资源争夺的重点。了海洋资源争夺的重点。