2018-2019人教新目标高中英语选修六课件:Unit 4 Period 1
2018-2019人教新目标高中英语选修六课件:Unit 4 Period 1第4页

2. There is no doubt that the earth is becoming warmer and that it is human activity that has caused this global warming rather than a _______ (随意的)but natural ____________(现象). 3. All scientists _________ (赞同)to the view that the increase in the earth’s temperature is due to the burning of fossil fuels like coal, natural gas and oil to produce energy.

random

phenomenon

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