The singer is known --------people in the world
题目
The singer is known --------people in the world
A.to B.by C.of D.for 为什么
答案
A BE KNOWN TO 为.所熟知
BE KNOWN FOR 因为.而出名
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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