请帮我用一篇简短的英文介绍一下西安的旅游景点,不需要太复杂
题目
请帮我用一篇简短的英文介绍一下西安的旅游景点,不需要太复杂
答案
The city of Xi'an was the first Chinese city to open up its doors to the Ancient world,not in 1980 under the "Open Door" policy but in fact during the Tang dynasty when Xian blossomed as the first sto...
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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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