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注意：
1. 短文开头已经给出，不计入总词数； 2. 词数：100左右
3. 参考词汇：生动的vivid；智慧intelligence复杂句使用不错，句法规范；文中词汇表达较恰当，高级词汇表达灵活；文章层次较为清晰。
Some political leaders do not enjoy managing decisions have caused problems.Faced major crisis(global warming,pollution,Global Finalcial Crisis) might undermine this stability and persistence around the world .If a huge revolution and policy change is much harder than policy stability, people might need to excavate the special factors that facilitate change.Three streams of activity are extremely important:the identification (and framing)people should make a concrete analysis of each specific question(the problem stream)the effectiveness of reliable solutions (the policy stream )the establish the adequate support(the politics stream)the role of policy entrepreneurs and social enterprenenrship.
