谁给用英语写一篇关于洪水的短文
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谁给用英语写一篇关于洪水的短文
答案
Floods are the world's biggest natural killer.When floods happen,crops are damaged ,houses are washed away,roads are destroyed ,and people are killed.Every year in America kills on average 138 people,...
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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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