改错:We can also learn many useful phrase and learn many about western culture
题目
改错:We can also learn many useful phrase and learn many about western culture
答案
We can also learn many useful phrases and learn much about western cultures.注：many 后接名词复数,故phrase要加S,culture -> cultures learn much about 关于……了解很多加油!不明白再问!...
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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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