Unit 4 Astronomy: the science of the stars（Warming Up, Pre-reading and Reading）

step 5 fast readinghow did life develop through history?read fast and find out the answers.a cloud of dust →a solid ball →presence of water →small plants grow on the water→ shellfish and other fish appear →plants begin to grow on dry land→ insects and amphibians appear→ retiles appear →dinosaurs appear→ mammals appearq: why was it necessary for plants to grow before animals? (plants provided oxygen for animals to breathe.)step 6 retellingsuppose you are dr. … who studies astronomy. you are invited to give a speech to the school students about the development of life on “earth day” (april 22nd). good morning/afternoon. i am dr…. i am greatly honored to be here to give you a speech about the development of life”. …homework: 1.                   search the internet for the information of the development of life.2.                   read and learn good words, phrases or structures from reading. 

period 2 reading (2)step 1 scanning1 what’s the style of the text?2 what’s the main idea of the text?step 2 skimmingfind out the main idea of each para.step 3 careful reading1 what was there on the earth before life could begin? 2. why do scientists think there has never been life on the moon?3. why did animals first appear in the seas?4. why did green plants help life to develop?5. why were mammals different from other animals? finish off the chart.1 small plants in water2 3 green plants on land4 insects(on land) 5 6 forests7 8 9
key to the exercise:2.shellfish and all sorts of fish  5.amphibian(on land and in water) 7.reptiles(on land) 8.dinosaurs(on land) 9.mammals(on land)t: that’s all for this passage. now let’s deal with some language points.step 4 consolidationt or f1.the earth was a cloud of dust before it combined into a ball around the sun.2.the water vapour, carbon dioxide, oxygen, nitrogen formed the earth’s atmosphere.3.the coming of small plants growing in the water made the earth different.4.land animals appeared before the green plants on land.5.dinosaurs produced their young by laying eggs.6.the earth may become too hot if too much carbon dioxide was put into the atmosphere.step 5 retellingretell the text using about 100 words.notes: use the two questions and the chart to retell the passage;