阅读下面短文，从每题所给的A、B、C、D四个选项中选出最佳选项。

Hi! I'm Alan. This is my dream house（梦幻屋）. It has a small but nice room. Some pictures are on the wall. There is（有） a bookcase in my room. There is a desk and a chair in it. My schoolbag is on the desk. There are two baseballs near it. Oh! Where is my pencil case? It is under the chair. There are some pencils and a ruler in the pencil case. My bags and a basketball are under the bed. I like my dream house very much.

①学习不仅在学校，在家里、在社会中也可以学习

②学习仅仅表现为接受和掌握

③生活中的点点滴滴都是学习

④只要努力学习，就可以成为伟人

涡虫身体背腹扁平，两侧对称．它属于下列哪类动物（　　）