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1、Unit 4Astronomy：the science of the starsSection Warming Up & ReadingPreparing 预习多维感知预习多维感知Section 预习多维感知预习多维感知Step One：Ask and Discussion1Do you know how many planets circle around the sun in our solar system?_答案：答案：Venus(金星金星)；Earth(地球地球)；Mars(火火 星星 )； Mercury(水水 星星 )； Jupiter(木木 星星 )；Saturn(土星土星)；
2、Uranus(天王星天王星)；Neptune(海王星海王星)2Each religion and culture has its own ideas about how life began on earth.What do you know?_答案：答案：In China，we all know that Pangu separates the sky from the earth.In western culture，God created the world in six days.Many scientists believe that the universe began with
3、a huge explosion called the “Big Bang”Step Two：Fast ReadingScan the text and then choose the best answer according to the text.1What is the correct order according to the text?The clever animals with hands and feet appeared and spread all over the earth.The “Big Bang.”Small plants began to appear on
4、 the surface of the water.65 million years ago， the age of the dinosaurs ended.ABC D答案：答案：D2How did the atmosphere on the earth appear?AIt came from space.BIt came from the explosion.CIt came from the oceans.DIt came from the forests.答案：答案：B3In our solar system，why does life only exist on the earth?
5、ABecause it is very warm on the earth.BBecause it is cool enough on the earth.CBecause there is plenty of water on the earth.DBecause it is big enough.答案：答案：C4 Why did plants appear earlier than animals?ABecause plants could produce oxygen，which was important for animals.B Because plants were more a
6、dvanced than animals.CBecause animals needed more water.DBecause plants needed more water.答案：答案：A5According to the passage we can know _.Aonly the earth has life on it in spaceBoxygen in the atmosphere on the earth came from the “Big Bang”Chumans are the cleverest animals of the earthDplants played
7、an important part in the appearance of animals答案：答案：DStep Three：Careful Reading1Read the text carefully and then answer the following questions.(1)Why was the earth different from other planets?_答答案案： Because the water remained on the earth.(2)Why did the plants grow before the animals came?_答答案案：Be
8、cause plants provided oxygen for animals to breathe.(3)Why is it wrong in films and stories to show dinosaurs and people together?_答答 案案 ： Because dinosaurs died out long before human beings developed on the earth.2Read the text and match each paragraph with its main idea.Paragraph 1()A.How humans a
9、ppeared and what effects they have caused to the earth.Paragraph 2()B.Water is very important for life on the earth.Paragraph 3()C.How the earth formed.Paragraph 4( )D.How the plants and animals on the earth developed.Paragraph 5()E.It is widely accepted that the universe began with a “Big Bang”答案：答
10、案：ECBDA3Read the text and write down the main idea of it.The text mainly tells us the _ of the earth and the _ of life on it.答案：答案：formation；developmentStep Four：SummaryRead the text carefully and fill in the blanks.The earth was just a cloud of 1._after the “Big Bang”The earth 2._loudly with fire a
11、nd rock. They were in 3._to produce many things，which were to make the earths atmosphere. As the earth cooled down，water began to appear on its surface. It allowed the earth to dissolve 4._gases.Then life began to develop.The first small plants 5._and filled the oceans and seas with oxygen.This enco
12、uraged the 6._of early shellfish and fish.Land animals such as insects，reptiles and dinosaurs and so on appeared after green plants appeared.Small clever animals 7._all over the earth.They are putting too 8._carbon dioxide into the atmosphere， which 9._ heat from the earth into space. Whether life w
13、ill continue on the earth for millions of years to come will 10._ on whether this problem can be solved.答案：答案： 1.dust 2.exploded3.time4.harmful5.multiplied6.development7.spread8.much9.prevents 10dependStep Five：Discussion1What problems have been caused by humans to the earth?_2As a student，what little things can we do for the earth?_本部分内容讲解结束本部分内容讲解结束点此点此进入入课件目件目录按按ESC键退出全屏播放退出全屏播放谢谢使用使用同学们来学校和回家的路上要注意安全同学们来学校和回家的路上要注意安全
