it was a cold night.I was sitting in bed reading a book.suddenly 编写故事
题目
it was a cold night.I was sitting in bed reading a book.suddenly 编写故事
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it was a cold night.I was sitting in my bed reading a book.Suddenly someone was knocking my window,and I looked through the window.I found that a person in red was waving the hands.I didn't know the p...
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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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