改同义句He bought the bike in 2007
题目
改同义句He bought the bike in 2007
句He bought the bike in 2007
He 【】【】the bike since 2007
He 【】【】the bike since 2 yeas ago
答案
He 【has】【had】the bike since 2007
He 【has】【owned】the bike since 2 yeas ago
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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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