reasons to host the Olympic games:例：a great honour
题目
reasons to host the Olympic games:例：a great honour
reasons not to host the Olympic games例：too expensive
答案
Reasons to host the olympic games.1.it is a great oppotunity for the host country to show its power to the whole world.2.The preparations will make the city better and more beautiful.3.Athletes all ov...
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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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