a 15-year-old b 15-years-old c15-year-olds d15 y
题目
a 15-year-old b 15-years-old c15-year-olds d15 y
a 15-year-old b 15-years-old c15-year-olds d15 years old he is 40years old and he is 25 years older than his son.he has a boy选哪个
答案
选A,15-year-old意思为十五岁大的,有连字符,它不用变复数的
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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