求英语口语对话!English learning!
题目
求英语口语对话!English learning!
答案
A:hello,pleasure to see you!How are you these days?B:not so fine.I don't get enough sleep.A:why?B:I'm busy improving my english.But I find it much more difficult than I thought.So I have to stay up un...
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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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