Ladt weekend ,I helped my grandparents their trip to Dalian,On Saturday morning,together with my gra
题目
Ladt weekend ,I helped my grandparents their trip to Dalian,On Saturday morning,together with my grandperents,I search the Internet for the train schedule,the weather in Dalian,and some hotel informations ,In the afternoon,we went to the train station and managed to buy two tickets for my grandprants would need,such as clothed ,glasses ,an umbrella,The next morning,I went to the station to show them off,Waved oodbye to them on the platform,I felt happily for them and wished them a safe journeyl.
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举一反三
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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