题目

阅读下面短文，在空白处填入1个适当的单词或括号内单词正确形式。 Arecent study shows that most adults household chores (active)when they were young. Most kids today do not do as many household chores(零活儿) as before, same study shows. Anexpert said, Parents today want their kids to spend more time things that can bring them money and honour. They have stopped (do)the one thing that has proven to bring success. That is doing householdchores. Anotherstudy finds that compared with the kids didn't do householdchores, young adults beginning chores at ages 3 and 413．下表是降耗技术改造后生产甲产品过程中记录的产量x（吨）与相应的生产能耗y（吨）标准煤的几组对应数据，根据表中提供的数据，求出y关于x的线性回归方程$\widehat{y}$=0.7x+0.35，那么表中m的值为（　　）x3456y2.5m44.5A．4B．3.5C．4.5D．3