根据所读内容洗柽正确答案。
An index(索引)is usually at the end of a hook.It tells us most of the topics the writer talks about in the book.The topics are usually listed from letter A to letter Z.Under each topic, there are some small topics, and we can find the page number after each small topic.Here is part of an index from a cookbook(烹调手册):
Potatoes Salads Sandwiches Soups
dry 63 cabbage 125 apple and beef 161 bean 189
French fries 67 chicken egg 137 cheese 170 beef 192
new 82 fruits 139 chicken 172 carrot 196
sour 100 green 151 cold meat 182 chicken 220
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