题目内容

At the beer-drinking contest the winner drank an average of 10 bottles of beer at the first 20 rounds. After a further 20 rounds the average increased to 15 bottles. What is the average for the last 20 rounds

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请设计一个实验，证明动物生长激素的分泌器官及其生理作用。材料有幼年狗、生长素注射液和解剖工具等。由此得出结论：______。

结合实际论述如何提高学生的元认知能力。

Marco Polo was born in Italy in 1254. He was the most (76) f westerner to visit China during the Middle Ages. He wrote a (77) b about his travels. He described all the things he saw and heard. Many people read the book, but (78) f believed what he said. He spoke of places and people that he knew about at that time. His father, Nicolo Polo, and his uncle were (79) wea traders, who regularly traveled to parts of the East. They visited China and became friends with Kublai Khan, the great Mongol (80) em. It was only when they (81) re to Italy from China that Marco, who was now 15 years old, first saw his father. Marco decided to accompany them for their next trip. It took them more than three years to travel the 9,000 miles to Shangtu, (82) cap of the Mongol Empire. Kublai Khan had many palaces and Shangtu was the one he used in the summer. It was (83) si in the mountains south of the Gobi desert. Every year when (84) su was over, he and his friends moved down from Shangtu to Dadu in the lowlands. This was his winter (85) p and it is now called Beijing.

某高中教师孙老师在谈到数学教学经验时指出，首先，通过各种方法，如开展问题研究、练习写论文等方法培养学生的学习能力，发展和完善智力素质。其次，重视基本知识的传授，加强基本概念的教学和基本技能的训练。同时，通过灵活多样的例子加深学生对基本的理解。第三，从教学学科特点出发，孙老师在学习上指导学生注意追根究底，寻找知识之间的联系和规律，培养学生的概括能力。第四，鼓励学生采用发现、探究的方法，寻找各种数学规则、原理及知识之间的内在联系。例如，当学生则入高中，上课不知如何听讲时，孙老师及时点拨：知识都是相互联系的，课堂上老师会重复以前的知识，这时应努力找到新旧知识的关系，这样学习数学就变得简单而有了趣了。第五，站在系统的高度选择教学知识，注意教学内容之间的内在逻辑联系。第六，在孙老师的课堂上，经常设计这样的问题情景，如“十字口的红、绿黄灯的时间比多少才合适？” “一笔款子怎样存可以获得较多的利息？”等通过情景教学激发学生的学习兴趣。请分析孙老师的以上做法符合哪些促进迁移的教学规律？