index of a book的用法和样例：
- Bibliography usually appears at the end of a book.
- He sat there idly turning the pages of a book.
- He is quick in grasping the gist of a book.
- The entire content of a book will be located on a single silicon chip.
- A PLA man made him a present of a book.
- A book is like a picture of life or of a city.