人教新课标必修三 Unit 4 Astronomy-Reading[课件]

3 3. The earth became a solid ball.
5 4.Small plants grew on the water.
9 5. Reptiles appeared.
7 6. Plants began to grow
2 7. The earth was a cloud
on dry land.
3) The _im__p_o_r_ta_n__ce_ of water for life.
4) The development of _p_l_a_n_ts_ anda_n_i_m_a_l_s_ on the
earth.
influence
5) The arrival of _h_u_m_a_n__s and their/_e_f_fe_c_ton the
earth. 8. The main idea of Reading1.
Ex.1 on P27
The text mainly tells us the _f_o_rm__a_t_io_n_ of the earth and the _d_e_v_e_lo_p_m__e_n_t of life on it.
forests
5.What life developed after forests appeared?
reptiles appeared dinosaur developed
6.What life developed after dinosaurs? mammals on land
7. What life developed after mammals? small clever animals
A. insects and amphibians appear
D
H
B. a solid ball
C. reptiles appear
B
A
D. a cloud of dust
E. shellfish and other fish appear
I
C
F. dinosaurs appear
G
F
G. small plants grow on the water
H. plants begin to grow on dry land E
J
I. presence of water
J. mammals (including humans )appear
Stage 1: The development of the earth
(1) After the Big Bang, what was the
11 12. Mammals appeared.
Ex.2 on P27
7. Conclude the main idea of each paragraph.
1) A widely _th_e_o_r_y_ about the o_r_i_g_in_ of the universe.
2) The formation of the _e_a_r_th__.
Water appeared
water is important for the beginning of life on the earth.
Why is water so important for the beginning of life?
Because water allowed the earth to dissolve harmful gases and acids into oceans and seas.
earth like?
a cloud of dust
a solid globe
(2) What happened next?
exploded with fire and rock
produced water vapour and gases
(4) What appeared as the earth cooled down?
• 2. What is the significance of the presence of water on the earth?
It allowed the earth to dissolve harmful gases into oceans and seas.
Put the order of development of life into a time line.
Stage2 The development of life
1.What life developed after water appeared? small plants appears in water
2.What life developed in water next? Shellfish and all sorts of fish
Reading-II----skimming (3m)
• Read paragraph 1, and answer the following questions.
• 1.How did water come into being on the earth?
The explosion of the earth produced water vapour, which turned into water when the earth cooled down.
• What are they doing on the earth?
Because they are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth into space.
The earth may become too hot to live on .
Can you put the order of development
of life into a time line?直击高考
8 1. Insects and
10 2. Dinosaurs appeared.
amphibians appeared.
Ex.5 on P27
How life began on earth is one of the biggest puzzles that scientists found hard to solve.
What other puzzles are hidden in the passage?
How does the universe(earth) form? Why did the earth cool down? Why did water disappear on other planet? How did the dinosaur disappear ?
of dust
4 8. Water appeared on the
6 9. Shellfish and other fish
earth
appeared.
1 10. The universe began
12 11. Clever animals with
with a “Big Band”.
hands and feet peared
布置作业Homework:
1. Finish the exercise 1and 2 on
page 63 2. Read the text again and find out your difficult points.
3.What about the life on land?
green plants began to
grow on land
insects appeared
4. What life developed next on land?
amphibians on land and in the water