my friend saved a _____ boy in the river yesterday
题目
my friend saved a _____ boy in the river yesterday
A.seven-years-old
B.seven-years-olds
C.seven-year-old
D.seven years old
答案
c
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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