Peter did very well in his examinations.In fact,I doubt anyone else in the class got __mark
题目
Peter did very well in his examinations.In fact,I doubt anyone else in the class got __mark
A a high B a higher
C the higher D the highest
答案
B a higher
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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