He won a gold medal in the Olympic Games,but he was just-----then A,at the age of 17 yeaes
题目
He won a gold medal in the Olympic Games,but he was just-----then A,at the age of 17 yeaes
B,a 17-years-old boy C,a boy of 17 D,a 17-year boy 为什么选C
答案
a改成at the age of 17 就对了
B改为：a 17-year-old boy就对了
d:改：a 17 years old boy就对了
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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