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必修3《Learning about Language》新课标PPT课件优质课下载
太阳系
According to the Big Bang theory , all things began with atoms. Then atoms combined（V.结合） to create stars and other bodies.
Big Bang: 宇宙大爆炸
theory: 理论
atom: 原子
For several billions of years after the “Big Bang”, in time a violent fire globe, the earth, formed. It was hot and could produce（vt.产生） carbon dioxide, nitrogen, water vapour and other gases,which were to make the earth's atmostphere.
billion:亿
in time: finally
globe:a ball
carbon dioxide:CO2
nitrogen:N
vapour :水蒸气
atmostphere: 大气层
violent :powerful
↓
The presence of water was fundamental to the development of life. Because it could dissovle harmful gases and acids. After that, a chain reaction followed, which made life possible.
presence:coming
fundamental:important
dissovle: 溶解
harmful:bad
acid: 酸
chain reaction:连锁反应
First, multiple small plants appeared （v.出现）in the sea and produced oxygen. With the oxygen, shellfish, amphibians, reptiles and mammals developed in their turn.
multiply：v.倍增→multiple : 成倍的
oxygen:O2