高中英语 unit4 Astronomy learning about language grammar教学课件 新人教版必修3 课件VIP免费

A time machineBig Banga solid globeatmosphere waterIt became very v______iolentIn time it produced some gases.The water on the earth is u_____ that on other planetswaternlikeplants in the watershellfish and fishplants on landinsects and amphibiansReptiles Dinosaurs Mammals They produced young by l______ eggs.ayingThey __________ young baby animals and produced milk to feed them.gave birth toDinosaurs e_____ on the earth for more than 140 million years.xisted prevent...from 使 ... 不做某事 , 阻止 ... 做某事Nothing will prevent us from studying hard.stopkeep One hundred and forty million years before humans ______,dinosaurs ruled the earth. At that time they had few natural enemies. So they developed quickly. They ____________ young by _____ eggs. Until now no one knows the exact reason why the dinosaurs were unable to ______ themselves _____ disappearing altogether. They died out _______. Maybe as some scientists guess, that the earth’s weather became hot and dry ____________ the dinosaurs’ life.existedgave birth tolaying prevent from in timewas harmful toFill in the blanks using some of the words on the blackboard.1. What he discovered has not yet been proved.The subject ClauseThe subject Clause3.It is an important topic for research why the earth is becoming warmer. 2. Whether other astronomers accept his idea remains a question.真正的主语形式主语主语从句 subject clause Find the sentences with the subject clauses from the reading passage in Par.3—5.Par3.4.It was not immediately obvious that water was to be fundamental to the development of life.5.What many scientists believe is that the continued presence of water …7.Whether life will continue on the earth for millions of years to come will depend on wheth...