求一份英语辩论会的开场白和结束语!主题：举办奥运会的利和弊.
题目
求一份英语辩论会的开场白和结束语!主题：举办奥运会的利和弊.
答案
"To be or not to be, that is the question". William Shakespeare had immortalised these few words in Hamlet.
May I say something to the same effect, "to do exercises or not to do exercises, that is the question".
You then lead to your stand...
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已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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