中共中央、国务院印发的《关于加强和改进新形势下民族工作的意见》强调，要以提高基本公共服务水平、改善民生为首要任务，重点搞好扶贫攻坚。在民族地区推动建立相互嵌入式社会结构和社区环境，加大双语教育力度，注重培养民汉双语兼通人才。从处理民族关系的角度简要说明国家实施上述举措的意义。

【提出问题】氢氧化钠溶液和稀硫酸是否能发生反应，若二者可以发生反应贝Ⅱ何时恰好反应。

【设计与实验】

甲组：取一定量的氢氧化钠溶液于试管中，然后向其中加几滴石蕊溶液，再向其中倾倒稀硫酸，并用玻璃棒搅拌，观察现象。

乙组：取一定量的氢氧化钠溶液于试管中，然后向其中加几滴酚酞溶液，再向其中逐滴滴加稀硫酸，并且边滴加边振荡，观察现象。

    David is from America. He and his family____(have) different plans for the coming holiday. David likes China very much and he____ (go) to Beijing last year. But he wants to know more about Chinese culture so he____ (visit) Beijing again. This time he is going to the Palace Museum. There____ (be) many interesting things about Chinese culture there. He____ (want) to take lots of photos of the things in the Palace Museum. He____ (show) them to his friends. David's father ____ (read) many books about Japanese history three months ago. He thought some things in Japan were interesting. He____ (take) a trip to Japan. David's mother didn't know where to go at first. At last she ____ (decide) to go to Singapore. She likes the climate (气候) there. What about David's sister? She ____ (stay) at home and do her homework.