look at that pretty girl do you know____?---she is a dance.A who she is B.who is she
题目
look at that pretty girl do you know____?---she is a dance.A who she is B.who is she
c what she is
D what is she
答案
c what she is
---she is a dance可以看出问的是职业,而不是姓名（A,B错了）
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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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