怎么用简单英语句子形容一下洪水灾难(5-9句话）
题目
怎么用简单英语句子形容一下洪水灾难(5-9句话）
答案
Flood,earthquake,volcanic eruptions,and severe weather conditions such as hurricanes and tornadoes.Flood can be common seen.It can be caused by the loss of vegetation,the enviroment disruption or the sea quake and so on.Flood can be very dangerous and of destructive force to human beings.many people lost their lifes in the flood,cities are ruined,thousands of properties are gone.
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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