把These are new pens.改成一般疑问句,肯否回答
题目
把These are new pens.改成一般疑问句,肯否回答
He has some friends.
Kang Kang comes from China.
改为否定句
答案
Are these new pens?
Yes,they are.
No,they aren't.
He doesn't have any friends.
Kang Kang doesn't come from China.
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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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