B

Most children don't enjoy doing housework. They like playing computer games rather than cleaning the rooms. But in Australia, Jim and Robert's mother, Mrs. Black, has good and proper methods to get their children to do housework. Here is an example. "Mum, have you worked out next week's housework? Let Jim and me choose the cards I can't wait. It's fun!" When Robert shouted out, his mother had already put all the cards on their big table. On the cards, there are some words like these, "sweep the floor, clean your bedroom, help mum cook, wash vegetables, make beds, feed the fish, cut the wood, clean the bathroom" and many others, Jim and Robert chose two cards for each day from Monday to Friday. Then they would hang them on the week day task board. Jim likes to clean the bathroom, so he picked up the card "clean the bathroom". Robert loves to make the bed so he picked up his favorite card. Jim again picked up "wash vegetables" and Robert chose "feed the fish". Soon the two boys were happy to take away all the cards to help the children do housework, their mother thought hard and came up with this idea. Of course, the parents did the housework on the weekends and left Jim and Robert two days free.

                                                                    Ryan

材料一：洋务运动中的民用工业，……其本身的资本主义性质已为今日时论所公认。……洋务工业的官督商办和官商合办，官领其总，商出资本，无疑是一种切实的倡率引导。它们于不知不觉中把封建主义的坚冰钻开了些微裂缝，而后，民族资本主义则可以沿着这些裂缝慢慢渗开。

——陈旭麓《近代中国社会的新陈代谢》

材料二：第一次世界大战使中国工商业获得向所未有的发展机会，同时日本在华企业亦获得同样侵略机会，中国的民族经济仍不易与之抗衡，以致归于失败。……中国民族经济之不能前进，以致渐趋衰退，不当尽归咎于外来压力。国内情况之日益恶化，亦为重大因素。政府之无扶植诚意，自然有关，战乱不止，兵额激增，尤为致命打击。

——郭廷以《近代中国史纲》

材料三：抗战期间国民政府经济管理办法一览表（局部）

请回答：

元朝建立时，对后世影响深远的制度是（    ）