急求英语作文,关于历史上的自然灾害(除了唐山、汶川地震)
题目
急求英语作文,关于历史上的自然灾害(除了唐山、汶川地震)
不需要太难,也不需要句式不同,10句左右
答案
Natural calamities is that what be happened abnormal phenomena , natural calamities sometimes are horrifying in Nature that human being is dependent on to damage brought about by human society. In them now that have earthquake , volcanic eruption , mud-rock flow , seaquake , stage manner , flood etc. to dash forward sending out the nature disaster; Also have surface subsidence , land desertification, are arid , coastline change waits for gradient disaster appearing gradually in more longtime middle ability; Still have the environment disasters that the human being activity leads to such as ozonosphere change , water body pollution , loss of soil and water , sour rain. These have complicated mutual connection between natural calamities and environmental disruption. Occurrence that human being asks to know these disasters on the significance from science
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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