用过去式写一篇英语短文,
题目
用过去式写一篇英语短文,
答案
Yesterday,I got up at 7 o'clock and had breakfast quickly.Then I went to school by bike.On the way to school,I saw a lot of birds on the trees singsing sweetly.And the sunshine was very bright.Although I was late for school,I was very happy.
能看懂不?挺简单的.
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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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