The walls were clean yesterday.The walls are dirty now(将以上两句话改写成一句话
题目
The walls were clean yesterday.The walls are dirty now(将以上两句话改写成一句话
答案
The walls were clean yesterday whereas (while) they are dirty now.
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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