the chinese ___ the first to use paper money pro
题目
the chinese ___ the first to use paper money pro
ably as early as the eleventh century
答案
The Chinese _were__ the first to use paper money proably as early as the eleventh century
中国人是最早使用纸币的,或许早在公元十一世纪就用了.
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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