用be anxious about/wait for the bus造句
题目
用be anxious about/wait for the bus造句
答案
1 be anxious about
The mother is getting more and more anxious about her son.He left home 6 hours ago and hasn't returned yet.
2 wait for the bus
When I saw him this morning,he ,too,was waiting for the bus.
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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