完形填空
    As a teenager, I am often asked what I am going to be in the future. A lawyer? A doctor? Or a scientist? No, my ideal career is to be a teacher. One of the 1for that is I want to be a teacher like Mr. Chen.
    "Look! Do you know what it is? A-ha, it's the  2 ! And it will always move around the sun."Mr. Chen said and pointed to his head. He then touched the nose and 3 , "Can you tell me the name of this mountain? It is the highest mountain on Earth! What's the  4of it? Yes, it's 8844.43 metres…" I'll never forget my first geography lesson. He was  5 humorous that we all fell in love with his lessons   6. It's Mr. Chen who opened the door of geography for us.
    Generally speaking, most of the teachers are strict7students and sometimes a little bit demanding（苛求的）, not so with Mr. Chen. He is a lighthouse, showing us the way to the treasure of knowledge. He is a friend and easy to get  8 with, always encouraging us to speak out loud without 9our shyness and other disadvantages. He is an example, volunteering his time to students and other teachers.
     One day I happened to meet him in the hospital. Seeing the cut on his arm, I realized he was donating his 10. I was moved and was  11 another lesson, a lesson of love and devotion.
    Every time I see my globe（地球仪）, it would 12me of Mr. Chen. He is the most unforgettable teacher I have 13met and he will always be. Someday I hope I am  14  to be a teacher like him.
    Thank you, Mr Chen, thank you for making learning not a job but a joy.
    Thank you for helping me to discover what I do best and to do it even  15Thank you for understanding all of us and giving us the time and care each of us needs.

 新中国承载着历史的沧桑，沉积着不同时期中国人民的深刻记忆。
材料一：“人有多大胆，地有多大产” -------1958年8月3日人民日报社论
材料二：1979年，对于中国是不平凡的一年，中国农民以特有的首创精神奏响了改革的序曲，随着农村改革的成功，城市经济体制改革也全面展开。
材料三：新世纪、新成就（单位：亿美元）

（1）根据材料一，指出当时经济建设中出现什么现象？给经济社会造成什么影响？
（2）中国农民的哪一重要举措奏响了改革的序曲？城市经济体制改革中的一个重要变化是什么？
（3）材料三中“新成就”取得与我国加入哪个国际组织直接有关？这一举措对中国经济产生了什么积极影响？
（4）材料表明新中国成长有经验也有教训，这对当前国家建设有何借鉴意义？

假设某星球表面上有一倾角为θ=37°的固定斜面，一质量为m=2.0kg的小物块从斜面底端以速度9m/s沿斜面向上运动，小物块运动1.5s时速度恰好为零．已知小物块和斜面间的动摩擦因数为0.25，该星球半径为R=1.2×10³km．（sin37°=0.6．cos37°=0.8），试求：