第2题
10-7-3-8-4-9-6-1-5-2-12-11
第3题
1 Because the water reminded on the earth.
2 Because plants provide oxygen for animals to breathe.
3 Because dinosaurs died out long before human beings developed on the earth.
4 The name is Pluto. Scientists now think it is too small to be called a planet.
5 Human beings caused global warming.
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