it is made of silk and is very comfortable 还是 it is made of silk and very comfortable
题目
it is made of silk and is very comfortable 还是 it is made of silk and very comfortable
答案
it is made of silk and is very comfortable 一个句子有2个谓语了,要删掉一个或加一个主语.it is made of silk and very comfortable.it is made of silk and （it）is very comfortable.
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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