题目

As we know, it is difficult for parents of every family to teach their children to be responsible(有责任的) for housework. Shatian School in Shanghai is making its students do housework for their parents. Third graders must learn how to cook and clean; sixth graders do the laundry, and seventh and eighth graders cook balanced meals with 15 yuan. Many parents think it's a good way for children to try housework, but they don't know how to do it at home. With the following ideas, you can get your children to help at home. If you want to make your children think that they can do everything qui15．电功率的国际单位是（　　）A．焦耳（J）B．伏特（V）C．欧姆（Ω）D．瓦特（W）