第228页 - 经纶学典学霸七年级英语上下册【江苏国标】

Most of books(on the bookshelves).

To know things about nature and how to do things.

Because he didn't know his grandpa wrote books.

A fantasy book.

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I like reading fantasy books. Because I can explore an amazing world when reading.(答案不唯一,言之有理即可)