大卫先生是一只奇怪的松鼠。他非常喜欢收藏各种书籍,不仅经常买很多新书,还喜欢捡别人不要的旧书。因此,小动物们都叫他“旧书先生”。这天,大卫先生在森林里开了一家小店。小店装修得很漂亮,门口的招牌上写着“知识小店”四个大字,下面一块小木板上写着:“一本旧书换一个知识!”大卫先生在门口收到书籍后,就根据顾客的需要提供一份打印好的资料。看,猴子杰森先生来到 Mr. David is a weird squirrel. He likes to collect books, not only often buy a lot of new books, but also like to pick up other people’s old books. Therefore, the animals are called him “old book ”. On this day, Mr. David opened a small shop in the forest. Small shop decoration is very beautiful, the sign on the door read “knowledge store ” four characters, the following piece of small board reads: “an old book for a knowledge! ” Mr. David received at the door After the book, according to the needs of customers to provide a printed material. Look, the monkey Mr. Jason came