人教版高中英语必修三unit4astronomythescienceofthestarsperiod1课件内容摘要：
to develop. 2 1 small plants in water 3 green plants on land 4 5 6 forests 7 8 9 2 shellfish and all sorts of fish 4 insects (on land) 5 amphibians (on land and in water) 7 reptiles (on land) 8 dinosaurs (on land) 9 mammals (on land) ________made it possible for life to begin to develop. Water Later _____________ appeared. land animals insects amphibians When plants grew into forests, ______ appeared for the first time. reptilesSome huge animals, called _________, developed. dinosaurs When dinosaurs disappeared, _________ became more important. mammals A cloud of dust → a solid ball → presence of water → on the water → shellfish amp。 other fish → plants begin to grow on dry land → insects and amphibians appear。阅读剩余 0%
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