Don't eat in class —— don't run in the hallways!

问题描述:

Don't eat in class —— don't run in the hallways!
don't eat in class ———— don't run in the hallways!选and 还是or请说明原因
这不是个否定句吗?怎么和选择 还有关系。 请自己想搞清楚在回答

and
前后是并列关系
构不成选择关系