How life began on the earth
I. Guess the main idea of the text from the title with the following question. What is the passage mainly about ? A. The birth of the earth B. Why dinosaurs d
ied out. C. The appearance and development of life on the earth. D. The fact that human beings caused global warming. II. Skimming(略读) Read the text quickly and find out the main idea for each paragraph Paragraph 1 a. The formation of the earth Paragraph 2 b. The importance of water for life Paragraph 3 c. A widely accepted theory about the formation of the universe Paragraph 4 d. The arrival of humans and their impact on the earth Paragraph 5 e. The development of plants and animals on the earth III. Scanning(细读） Read the text carefully and do the following parts Part1. Read the following sentences, tell “True” or “False” 1.According to a widely accepted, the universe began with a “Big Bang”. 2.Between 4.5 and 3.8 billion years ago, the dust settled into a solid globe. 3.Water has never appeared on other planets like Mars. 4.Finally about 2.6 millions years ago some clever animals, now with hands and feet, appeared and spread all over the earth. Part2 Read the 4th paragraph and finish the following chart Time The information from the reading passage The first extremely __________plants began to appear on the surface of the Many millions water. They multiplied and filled the oceans, which encouraged the later of years late development of early shellfish and all sorts of ______. ______.plants began to grow on land .They were followed in time by land Next animals. Some were . Others, called amphibians. When the plants grew into ______ , reptiles appeared for the first time. After Later that, some animals, called dinosaurs, developed. 65 million The age of _________ended. This disappearance made possible the rise of years ago ___________ on the earth. IV. Summary Fill in the blanks using the proper words of the text and complete the summary of the text The earth was just a cloud of ____1_____ after the “Big Bang”. The earth ____2_____loudly with fire and rock. They were in ____3____ to produce many things, which were to make the earth’s 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 encouraged 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 will continue on the earth for millions of years to come will ___10__ on whether this problem can be solved. V. Recalling(回想) Put the order of the development of life into a timeline a. Insects and amphibians appeared. b. Dinosaurs appeared. c. The earth became a solid ball. d. Small plants grew on the water. e. Reptiles appeared. f. Plants began to grow on dry land g. The earth is becoming warmer. h. Water appeared on the earth. i. Shellfish and other fish appeared. j. The universe began with a “Big Bang”. k. Clever animals with hands and feet appeared. l.. Mammals appeared
The order of development of life
The universe began with a “Big Bang” 2 3
Shellfish and other fish appeared
Insects and amphibians appeared
Clever animals with hands feet appeared
VI. Discussion How to prevent our earth becoming warmer Here are two situations related to the problem. Each group chooses one to discuss. Each member should give at least one idea. The reporter writes down all the ideas. Some will be asked to give a report. Situation 1. If your uncle lives in the countryside, and he often cuts down some trees for building materials, what would you like to say to stop his cutting trees? And tell reasons. Situation 2 If your father works in a town, and his office building is not far from your home. He used to go to work by bike, but now he drives a second-hand car to work, what would you like to say to change his mind? And tell reasons VII. Homework According to your discussion, write a short passage on how to solve the global warming.