( ) people learned to read in the past because books were expensive and rare
题目
( ) people learned to read in the past because books were expensive and rare
( )people learned to read in the past because books were expensive and rare
A.Few B .A few C.Little D.A little
答案
A people可数排除CD 表示否定排除B
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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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