Members go on the site and register the books they own and would like to share.BookCrossing provides an identification number to stick inside the book.Then the person leaves it in a public place, hoping that the book will have an adventure, traveling far and wide with each new reader who finds it．

　　Bruce Peterson, the managing director of BookCrossing, says, “The two things that change your life are the people you meet and books you read.BookCrossing combines both.”

　　Members leave books on park benches and buses, in train stations and coffee shops.Whoever finds their book will go to the site and record where they found it.

　　People who find a book can also leave a journal entry describing what they thought of it.E－mails are then sent to the BookCrossing to keep them updated about where their books have been found.Bruce Peterson says the idea is for people not to be selfish by keeping a book to gather dust on a shelf at home.

　　BookCrossing is part of a trend among people who want to get back to the “real” and not the virtual(虚拟)．The site now has more than one million members in more than one hundred thirty－five countries.

　　【语篇导读】　这是一篇说明文。主要介绍了BookCrossing.com网站所举办的图书分享活动，内容涉及这一活动的目的和一些具体情况。

　　★1.Why does the author mention book groups in the first paragraph?

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