mary and tom are in different departments.they run into each other on campus.Tom asks Mary about her
题目
mary and tom are in different departments.they run into each other on campus.Tom asks Mary about her department major and other related questions
答案
mary和tom在不同的系科,他们在校园中相遇了,tom问mary她主修的是什么系以及一些其他相关的问题.
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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