要求：不少于50词。
Our School Library
There is a big library in our school. There are lots of books in the library. You can find all kinds of books here. The books about animals are on Shelf A. The books about sports are on Shelf B. The
古人这样评价大运河：“北通涿郡之渔商，南运江都之转输，其为利也博哉。”从中可以看出大运河直接作用是（ ）
—_______.
