It is Saturday morning. Mrs. Black and her daughter Kate go to the bookshop near their house. Mrs. Black wants to buy some picture books for her grandson. Kate wants to buy some storybooks. In the bookshop Kate meets her old classmate, Sue. They are good friends. They talk and talk for a long time and forge to buy books. At twelve o'clock Mrs. Black finds them and asks Sue to go and have lunch in their house, Sue says: “Yes.” The two girls are very happy.

中学生李某从小养成了许多不良习惯，后来发展到偷同学的钱包，被学校和家长批评教育。但他仍不悔改，与社会青年结伙斗殴，被公安机关拘留。后来因与社会上的“哥们儿”持刀抢劫，被判处有期徒刑。这个案例给我们的启示是（  ）

①一般违法与犯罪之间没有不可逾越的鸿沟     ②青少年要重视道德修养，防微杜渐，防患于未然 

③一般违法与犯罪之间没有本质的区别            ④违法一定发展成犯罪