Mr Black will come back from the USA in two weeks.will Mr Black come back from the USA
题目
Mr Black will come back from the USA in two weeks.will Mr Black come back from the USA
答案
Mr Black will come back from the USA in two weeks?
(How )(soon )will Mr Black come back from the USA
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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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