The proverb you mentioned com from a poem by Mao Zedong,

　　first chairman of China. It' meaning is “He who has never been to the Great Wall is not a true man”. The Great Wall stands b difficulties a hero wants to overcome.

　　You are a true me now, aha！

　　Best wishes！

　　Yours，

　　Li Hua

　　H

　　If people suddenly disappeared from the Earth, our planet would look as it did 100,000 years before. If insects disappeared, nothing that on land would survive. These words show that it is stupid to think that humans are the most important living thing in the world. We are just part of the ecosystem and other things may be many more important than us.

　　Human activities in the past have increased global concern for the balance between human life and ecosystems. The causes is common to all humanity. Three driving forces affected our global environment.

　　The rapid population grow makes the political and economic problems worse. With the social, economic and political problems caused by humans, the global environment would probable be in much better shape. However, in order to make the world better place to live, we should protect the ecosystem around us.

　　答案：

　　If people suddenly disappeared from the Earth, our planet would look as it did 100,000 years befor. If insects disappeared, nothing

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