Before she could move,she heard a loud noise,which grew to a terrible roar.为什么要用Which?
题目
Before she could move,she heard a loud noise,which grew to a terrible roar.为什么要用Which?
答案
which是非限定定语从句的引导词,在从句中作主语,先行词为a loud noise.
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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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