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新疆巴州且末县中学 人教版 必修三 unit4阅读

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The Solar System
       Unit 4 reading

How Life Began on the Earth
     listen to the tape and match the main idea of each 
                       paragraph

       Paragraph 1: d a. The importance of water for life 

                      b. The development of plants and 
{      Paragraph 2: c    animals on the earth 
       Paragraph 3: a c. The formation of the earth 
                      d. A widely accepted theory about 
       Paragraph 4: b    the formation of the universe 
{                     e. The arrival of humans and  their   
       Paragraph 5:
                  e      impact(影响)    on the earth 
Stage1  The development of the 
earth 
         Time               The earth
  Several billion years 
                      A cloud of dust
  after the “Big Bang”
   Between 4.5 and 3.8 
                      A solid globe
   billion years ago
                      Exploded with 
                      fire and rock
                      Produce carbon, N2, 
                      water vapor, etc.
 As the earth cooled  Water began to 
 down                 appear. Water is 
                      fundamental to the 
                      development of life
Stage2  The development of life
    Read para4-5 and fill in the 
                blanks
     plants               animals
 small plants in water Shellfish and all 
1                    2 sorts of fish

   Green plants on land    4insects
 3                         5amphibians

                           7  reptiles
     6 forests             8  dinosaurs
                           9 mammals
                           10 humans
 1.Who are the small clever animals 
with hands and feet? 
2. Are they taking good care of the 
earth? Why?
Because they are putting too much carbon 
dioxide into the atmosphere.


The earth may become too hot to live on .
The earth is 
becoming 
hotter and 
hotter!

WhetherOnly if we  life care will will continue we help, on the 
earth depends on human beings.
only if we help shall all be saved!
Love ourselves, love our earth !

            summary
• After the “big bang”, the earth was 
 still  just a clouddust of _______,it 
 _______loudlyexploded  with fire and rock, 
 which were _____in time to produce 
 the_________,carbon  water vapour and other 
 gases. Then ________water  began to 
 appeared on the earth. 
 The____________ small plants  in water are considered 

to be the earliest lives on the earth. The O2
they supplied encouraged the lives of____shell-
__________.-fish and fish  Slowly green plants grew on 
land, which were followed by __________land animals
like insects & ________.amphibians  When the plants 
grew into______,forests  ______reptiles appeared. Then 
_______dinosaurs developed but disappeared later, 
which made the rise of  a totally different 
animal,______,mammal  possible, and finally humans_____ 
spread all over the world.
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