E-books are nothing but online books.The only difference between an e-book and a book is that one has a physical existence while the other dwells in the virtual world of the Internet.Content is the same for both.And you are saved from the hassle of carrying books as well.

There are various e-book depositories from which you can either buy or download e-books.The process of downloading them is very easy.The websites give proper instructions and you just need to follow them to get hold of the book of your choice.Moreover，if you do not want to make investment，just read it by opening the online depository and read it for free.

From entertainment to business，e-books prove to be handy for all purposes.The time will come when they will become the most important entertainment option for many people.

21．Compared with traditional books，e-books are more popular because they are________.

A．more attractive

B．more interesting

C．more convenientD．more expensive

22．The main idea of the second paragraph is that________.

A．it’s convenient for us to read with the help of the Internet

B．technology has been developed a lot in the past few years

C．the Internet is full of a large amount of useful information

D．it is very tiring to carry heavy books here and there

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