题目
Could you explain what greenhouse effect is?What can we do with it?回答这个话题!
提问时间：2020-07-24
答案
这句话的中文意思是：你能解释温室效应吗,我们能做写什么?
Lately ,global warming is becoming a serious problem.Several factors contribute to it.First of all,a lot of greenhouse gas is produced by cars and factories; furthermore,the loss of forests is another cause of global warming.Global warming will cause some harmful effects.Firstly,some islands will disappear because of the rise of sea level.Secondly,extreme weather results from global warming.When temperature rises,the production of crops will decrease.Besides,some animals and plants will disappear,thus destroying the ecosystem.So we should protect the earth from greenhouse gases.We should plant trees and reduce the amount of carbon dioxide and other greenhouse gases.Hope our earth can
become better and better.
Lately ,global warming is becoming a serious problem.Several factors contribute to it.First of all,a lot of greenhouse gas is produced by cars and factories; furthermore,the loss of forests is another cause of global warming.Global warming will cause some harmful effects.Firstly,some islands will disappear because of the rise of sea level.Secondly,extreme weather results from global warming.When temperature rises,the production of crops will decrease.Besides,some animals and plants will disappear,thus destroying the ecosystem.So we should protect the earth from greenhouse gases.We should plant trees and reduce the amount of carbon dioxide and other greenhouse gases.Hope our earth can
become better and better.
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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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