What is this?变为复数句___________________________.
题目
What is this?变为复数句___________________________.
It is an arm.变为复数句___________________________.
This is a foot.变为复数句___________________________.
What are these?变为单数句___________________________.
These are bags.变为单数句___________________________.
This is a boy.变为复数句______________________________.
答案
what are these?
They are arms.
These are feet.
What is this?
This is a bag.
These are boys.
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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