Exposed in the sun for a long time,the door of those poster has gone.
题目
Exposed in the sun for a long time,the door of those poster has gone.
Being exposed in the sun for a long time will have bad effects on us.
这类句子英语老师说句子中间有逗号开头用ed,无逗号用ing是怎么回事?为什么有的句子又不是这样的,很疑惑啊
答案
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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