求关于动物生存现状的英文稿,不需要太长
题目
求关于动物生存现状的英文稿,不需要太长
答案
According to scientists,more than one and one-half million species exist on the earth today.However,recent estimates state that at least 20 times that many species inhabit the planet.
In the United States,735 species of plants and 496 species of animals are listed as threatened or endangered.
266 of these listed species have recovery plans currently under development.
There are more than 1,000 animal species endangered worldwide.
There are more than 3,500 protected areas in existence worldwide.These areas include parks,wildlife refuges and other reserves.They cover a total of nearly 2 million square miles (5 million square km),or 3% of our total land area.
Aquatic species,which are often overlooked,are facing serious trouble.One third of the United States‘s fish species,two-thirds of its crayfish species,and almost three-quarters of its mussel species are in trouble.
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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