[填空题]{{B}}Library{{/B}} Looking up material for a research paper in a library should begin with the main(1)______. You can find cards bearing 1. ______ key information about the books in the library in the small drawers. We have three types of cards for each book, namely, (2)______cards, author cards and title cards. They are all 2. ______ (3)______ordered. For the sequence of author cards, 3. ______ (4)______names come first; while for title cards, articles 4. ______ like the, a, an are(5)______. 5. ______ On each card there is a (6)______number, through 6. ______ which you can easily find the book among the shelves. But if the book is stored only on the(7)______stacks, you must have 7. ______ the help of a librarian to get the book. In that ease, you need to fill in a call slip. Before you can take the book out, the librarian m

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