1、河北省撫寧縣第六中學(xué)高中英語Unit4 Astronomy the science of the starsreading學(xué)案（2） 新人教版必修3Step1.Scanning1.match the main idea with each paragraph.Para. 1 formation (形成) of the earth.Para. 2 The importance of water for life.Para. 3 A widely accepted theory about the formation of the universe.Para. 4 The arrival of h

2、umans and their impact on the earth. Para. 5 The development of plants and animals on the earth.2.Divide the text into 2partsStage 1 : The development of the earth (para _ _ )Stage 2 : The development of life (para _ _ )Step2.Carefully reading1.Finish the following tasks.Stage 1: The development of

3、the earth(1) After the Big Bang, what was the earth like?Its still just _ _ _ _. The dust settled into a _ _. (2) What happened next?It _ with fire and rock and produced _, _, _ _ and other _.(3) What did the water vapour and gases form? _ _ _.(4) What appeared as the earth cooled down? _ appearedWh

4、y is water so important for the beginning of life? _Stage2 The development of life(1)What life developed after water appeared? _ _appears in water(2)What life developed in water next? _ and all sorts of _(3)What about the life on land? _ and _ appeared(4.)What life developed next on land?The plants

5、grew into _ ,_ appeared and _ developed.Are they taking care of the earth well? Why?_2.Can you put the order of development of life into a time line?( )(1) Insects and amphibians appeared. ( )(2)Dinosaurs appeared.( )(3)The earth became a solid ball. ( )(4)Small plants grew on the water.( )(5)Reptil

6、es appeared. ( )(6)Plants began to grow on dry land.( )(7)The earth was a cloud of dust ( )(8)Water appeared on the earth( )(9)Shellfish and other fish appeared. ( )(10)T he universe began with a “Big Bang”.( )(11)Clever animals with hands and feet appeared ( ) (12)Mammals appeared.3. Fill in the bl

7、anks in the following form.TimeWhat happenedBig Bang_ began to form and combine to create stars and other bodies.Between 4.5 and 3.8 billion years agoDust settled into a solid and _ globe.The earth exploded to produce its _.The continued _ of water allowed the earth to dissolve harmful gases and _ i

8、nto the oceans and seas.Many millions of years laterThe first small plants on the surface of the water produced _.Early _ and all sorts of fish appeared.Green plants began to grow on land. Insects and _ appeared.Many millions of years later_ appeared and they laid eggs.Dinosaurs developed, laid eggs

9、 and _ for more than 140 million years.Mammals rose and _ babies.About 2.6 million years agoSome small _ animals with hands and feet appeared and spread all over the earth.NowHumans produce too much carbon _, making the earth too hot.4. True (T) or False (F).(1)The earth appeared before the Big Bang

10、 happened.(2)The original atmosphere consisted of nitrogen and oxygen. (3)Oxygenwas important to the development of fish?(4)Life began in water and then on land.(5)The disappearance of dinosaurs made the possible the rise of mammals on the earth.(6)Dinosaurs could give birth to young baby animals an

11、d produced milk to feed them. (7)Human beings produce too much carbon dioxide which causes the global warming on the earth. (8)According to the text, human beings would disappear in the end. Step3.Phrases and Useful Expressions1.according to _ 2.a widely accepted theory_3.begin with _ 4.in all directions _5.several billion years _ 6.whetheror not _-7. in time _ 8.cool down _9.be fundamental to_ 10.a chain action _11.make it possible forto