小学五年级英语作文题目--weeting a tourist
题目
小学五年级英语作文题目--weeting a tourist
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I had a very Saturday.In the morning ,I cleaned my room,then I had to wash my clothes.In the afternoon,I did my homework.It was very and I finished it quickly.In the evening,I visiyed my fried.We had ...
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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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