Was either of your parents born in another country?
题目
Was either of your parents born in another country?
Was either of your parents born in another country?
A.No,they were both born here.
B.Yes,both of them.They were born in Poland.
C.No,my mother was.
选哪个?为什么,简明扼要,
答案
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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