unit 5 the power of nature
导读：海啸，地震，干旱，泥石流，台风……，地球母亲一次又一次的向人类发出警示： 人类应该为自己的行为负责！
task: let's take action！
man and nature
it is believed that humans are the real offenders of natural disasters. people, though the victims in these natural events, pays for the debt that their excessive development has brought about. natural disasters can be prevented, but the dreadful injury on people can hardly be healed. judging from these disasters, can we come to a conclusion that today's topic sho资源难易程度:★★★★★★★★★★★★★★★
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