They are coming to her home at 6:00p/m.__them is an American girl.Her name is Helen.A.In B.Among
题目
They are coming to her home at 6:00p/m.__them is an American girl.Her name is Helen.A.In B.Among
C.About D.With
答案
B,他们当中有一个是美国女孩.
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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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