把单数改成复数,把复数改成单数 说明理由
题目
把单数改成复数,把复数改成单数 说明理由
This is a book
That is a box
Are those rulers
What are these?
They are toys
That is an egg
What's this in english?
Your bok isn't in the desk
Is it your schoolbag?
答案
These are booksThose are boxesis that a ruler What is this?it is a toyThose are eggsWhat are these in English?Your books aren't in the deskare they your schoolbags?
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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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