A:①②
B:②③
C:①④
D:③④
Our government has tried every means to make children enjoy the equal right to receive education, ________ their financial situation.
①消费者需求变化决定企业的市场地位
②经营者产品开发要以市场需求为导向
③企业的市场影响力关键在于产品创新
④企业多元化发展确保提高企业盈利率
现有点A(2,0)和抛物线E上的点B(-1,n),请完成下列任务: