---Do you know the soldiers came to Yingxiu Town?
题目
---Do you know the soldiers came to Yingxiu Town?
---Do you know the soldiers came to Yingxiu Town?
--The roads were badly broken.They had to walk there.
A.why B.when C.how D.where 完整的题
答案
C how
题干：你知道——士兵到映秀镇?
道路损毁很严重,他们得步行到那.
所以填how 如何到达
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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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