【公开课】必修四Unit 4 Reading

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 such as human beings
Can you put the order of development of life into a time line?
8 1. Insects and amphibians appeared.
10 2. Dinosaurs appeared.
3 3. The earth became a solid ball.
Paragraph 1: Paragraph 2: Paragraph 3:
Big Bang atmosphere water
the development of the earth
Paragraph 4: Paragraph 5:
plants and animals human beings
the development of life
later, which made the rise of a totally different animal,_m_a_m_m__a,l possible, and finallyh_u_m_a_n_sspread all over
the world.
Thank you~
star 恒星
Pluto planet 行星
பைடு நூலகம்
comet 慧星
shooting star/ meteor 流星
black hole 黑洞
Pre-reading
1.Have you ever asked your mother, “Mom, where do I come from”?
2. Nearly everybody has this or that puzzles: How do human beings come into being? How does the earth come into being?
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
Stage 2: 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
T_h_e_s_m_a_l_l _p_la_n_t_s in water are considered to be the earliest
lives on the earth. The O2 they supplied encouraged the lives of_s_h_e_l_l-_f_is_h__an_d__f_is_h. Slowly green plants grew on land, which were followed by _l_a_n_d_a_n_im__a_ls like insects & _a_m_p_h_ib_i_a_n.sWhen the plants grew into_f_or_e_s_t_s, _re_p_t_i_le_sappeared. Then d_i_n_o_s_a_u_rsdeveloped but disappeared
Reading
Can you predict the main idea of this text by looking at the tittle How Life Began on the Earth?
the origin of earth
Read the passage carefully and analyse its structure. Find out the keywords of these paragraphs.
(2) What happened next?
exploded with fire and rock
produced water vapour and gases
(3) The water vapour and gases form the _a_t_m__o_sp_h__er_e__.
(4) What appeared as the earth cooled down? water
4
10. The universe began with a “Big Band”. 1 12. Mammals appeared.
12 11. Clever animals with hands and feet 11
appeared
summary
• After the “big bang”, the earth was still just a cloud of __d_u_s_t__,ite_x_p_l_o_d_e_dloudly with fire and rock, which were _in__ti_m_eto produce the__ca_r_b_o_n___, water vapour and other gases. Then _w__a_te_r___ began to appeared on the earth.
Stage 1: The development of the earth
(1) After the Big Bang, what was the earth like at first ?
a cloud of dust
a solid globe
4.5-3.8 billion years
Earth \(≧▽≦)/
Why is water so important for the beginning of life?
Because water allowed the earth to dissolve harmful gases into oceans and seas. This produced a chain reaction, which made it possible for life to develop.
Warming Up
What are the planets in our solar system?
火星 Mars
天王星 Uranus
水星 金星 地球 Mercury Venus Earth
木星 土星 Jupiter Saturn
海王星 Neptune
What interests you in astronomy ? the Milky Way 银河
5 4.Small plants grew on the water.
9 5. Reptiles appeared. 2 7. The earth was a cloud of dust 6 9. Shellfish and other fish appeared.
7 6. Plants began to grow on dry land. 8. Water appeared on the earth