【正确答案】正确答案： Using the Library You look for a book in one of two ways: / either you'll know the author and title of the book, / or else you'll want a book on a particular subject. / Let's start with what to do / if you know the author's name and the title of the book. / The first thing is to look up the author's name in the Author Catalogue. / If you can find a card for the book, / you should then write down three things: / the author, the title and the class number. / Now find the class number on the library shelves. /