What we can't afford to lose 求演讲稿三分钟左右的演讲时间,会有评委提问.主题如上

第一句深情地问一句：What we can't afford to lose？ 然后，沉默不语注视观众2分55秒，期间不要笑，保持表情严肃，突然大喝一声：TIME!
观众席上于是响起了热烈的掌声。

What we cannot afford to lose
Good afternoon,ladies and gentlemen.Today is my great honor to be here and do the speech.I will try my best!The title of my speech is ‘what we cannot afford to lose’.
As we all know,so many precious things exist throughout our life.Time,joyful memory,some qualities like bravery and honesty,even a fine gift from someone special,for us,are all what we want to keep forever.However,in my mind,what we cannot afford to lose is our only homeland——the earth.
Suppose you are standing in a forest,birds are flying in the sky,they are so happy; red flowers,green grass,butterflies are dancing in the air,they are so cheerful.Then one day a strange creature appears,walking on its two hind legs and staring at you.Greatly alarmed,you stop singing and fly away.Since then,more creatures have appeared.They clear the land and cut down trees.As a result,you don't have enough food or shelter.Some of your friends have died of drinking the wastewater they pumped into the stream or of eating the litter they left on the ground.The forest is dead silent now except for the noises those creatures make.Sadly,you think by yourself,"Maybe it is time for me to go."
Ok,the imagination is over here.Now we need to face the reality.What is the reality?I think most of us can answer it without thinking.All kinds of pollutions,all kinds of scarce resources,all kinds of unpredictable disasters and all kinds of~etc..Ionically,the history of the development of human civilizations is also the history of men’s increasing destruction of nature.But we put much attention on Wall Street rather than PM 2.5 of the air quality we should achieve.
The mother earth give us too much that we cannot afford to lose her.To do something we can do for her is our responsibility.At last,I want to end my speech with some words from Hillary Clinton.Though the journey ahead will not be easy,we still need to try our best to do it with a heart filled with gratitude and with deep and abiding love for our sole homeland and with nothing but optimism and confidence for the days ahead.
That is all!Thank you for listening!
祝你演讲成功,好好表现!