阅读理解：

　　Is your schoolbag too heavy to carry? The e-schoolbag will help you．In fact, the e-schoolbag should perhaps be called an e-textbook．It is a small computer for students．Heavy schoolbags have been a serious problem for them for a long time．But the e-schoolbag will change everything．

　　It is much lighter than a usual schoolbag．Also, it is as small as a usual textbook, an exercise book and so on．They can be made into chips that are as small as a stamp．The students can read the text page by page on the “screen”, take notes, or even send e-mails to their teachers．All they have to do is to put the right chip into the e-schoolbag and press the button．

　　It is said that e-schoolbags have been put into use in some Chinese middle schools．In 2012, some students in Shanghai started to use e-schoolbags in the new term．Some say that e-textbooks can be easily broken．Some say it is not good to students' eyes．But only time will tell us all．

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阅读理解。阅读下列材料，从A、B、C、D四个选项中选出最佳答案。

　　Look at the center circles of Diagram(图)A and Diagram B．Which of the centre circles looks larger?

　　Take a first look and you probably think that the centre circle in Diagram A is smaller than that in Diagram B．In fact, they are exactly the same sze．

　　Then look at the picture on the right．What do you see? A vase(花瓶)? Or two faces? Does the picture change quickly from one to the other again and again? Maybe yes or maybe no, but you can never see them at the same time．

　　“ What's happening? Is something wrong with my eyes? ” You may wonder a what you see．Don't worry．Here is how it goes：

　　When we look at things, our eyes send messages to our brains and then our brains interpret(解读)the information．However, sometimes our brains interpret the received information in a wrong way．It seems that our eyes are playing a joke on us．This often happens and we call it “ Visual illusion(视觉错误)”．

　　Movie makers often make use of illusions．They make the objects around actors much smaller or bigger than usual．This makes us believe that the actors are much larger or smaller than they usually are．The movies Jurassic Park and Honey I shrunk the kids just make use of illusions．

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　　The Internet is becoming important in our life．How much do you know about it?

　　What is the Internet?

　　The Internet is a large, worldwide collection of computer networks．A network is a small group of computers put together．The Internet is many different networks from all over the world．These networks are called the Internet．Once you have learned to use the Internet, you can have a lot of interest in the World Wide Web．

　　What is the World Wide Web?

　　The World Wide Web has been the most popular development of the Internet．The Web is like a big electronic book with millions of pages．These pages are called homepages．

　　You can find information about almost anything in the world on these pages．For example, you can use the Internet instead of a library to find information for your homework．You can also find information about your favourite sport or film star, talk to your friends of even do some shopping on the pages．Most pages have words, pictures and even sound or music．

　　What is e-mail?

　　Electronic mail(e-mail)is a way of sending messages to other people．It’s much quicker and cheaper than sending a letter．

　　If you want to use e-mail, you must have an e-mail address．This address must have letters and dots and an@(meaningat)．This is what an address looks like：emily @ star．net．Write a message across the Internet．People don’t need to use stamps, envelopes or go to the post office since the invention of the Internet．Quick, easy and interesting-that’s the Internet!

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　　The Internet is becoming important in our life．How much do you know about it?

　　What is the Internet?

　　The Internet is a large, world-wide collection(聚集)of computer networks(网络)．A network is a small group of computers put together．The Internet is many different kinds of networks from all over the world．These networks are called the Internet．If you have learned to use the Internet, you can have a lot of interest on the World Wide Web(网)

　　What is the World Wide Web?

　　The World Wide Web has been the most popular development of the Internet．The Web is like a big electronic(电子)book with millions of pages．These pages are called homepages．

　　You can find information about almost anything in the world on these pages．For example, you can use the Internet instead of a library to find information for your homework．You can also find information about your favourite sport or film star, talk to your friends or even do some shopping on the pages．Most pages have words, pictures and even sound or music．

　　What is e-mail?

　　Electronic mail(e-mail)is a way of sending messages to other people．It' s much quicker and cheaper than sending a letter．If you want to use e-mail, you must have an e-mail address．This address must have letters and dots(点)and an" @ "(means "at")．For example：Lily@Yahoo, com．Write a message, type a person's e-mail address, then send the message across the Internet．People don't need to use stamps, envelopes or go to the post office since the invention of the Internet．Quick, easy and interesting－that' s the Internet．

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