he was too old to take care of himself改为复合句 he was （ ）old （）he take care of himself
题目
he was too old to take care of himself改为复合句 he was （ ）old （）he take care of himself
答案
He was so old that he couldn't take care of himself.(后半部分应是：he couldn't take care of himself.)
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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