已知某物体的位移S（米）与时间t（秒）的关系是S（t）=3t﹣t²．

（Ⅰ）求t=0秒到t=2秒的平均速度；

（Ⅱ）求此物体在t=2秒的瞬时速度．

2011年9月10日，山东省省长姜大明省长到泰安指导工作时指出：“保持经济平稳较快发展必须强大国有经济、集体经济，并进一步激活民间投资，扩大市场准入范围，鼓励民间资本以多种方式，进入基础产业、市政公用事业、金融服务等领域，多种经济方式共同发展。” 

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　China is a great country    1    5，000 years of history. There are many    2    which attract millions of tourists from all over the world every year. Some of them are fantastic lakes, beautiful mountains and long rivers.

Many mountains,   3    Mount Tai, Mount Emei, Mount Hua, are very famous. People go to Mount Tai to see the sun  4  . Among the rivers, the Yangtze River is the longest one and the second    5   one is the Yellow River. They are the birthplaces of Chinese culture.

Have you    6    the love story about Xu Xian and White Snake?  It is said that the story    7   on West Lake. West Lake is the most fantastic place that I have    8   visited. It lies in Hangzhou, Zhejiang Province. It is surrounded on three sides by    9   . Many tourist attractions there are well worth visiting such as Sudi Causeway, the Broken Bridge and Leifeng Pagoda. The scenery is so attractive that visitors often lost    10    in it.