高中英语必修三unitreading公开课

Let’s brainstorm the following questions
1. Who are our ancestors?
2. 2. Do you know how life begins on the earth?
Let’s enjoy a video first.
①
②
③
④
Try to put the ⑥
but not on other planets ?
4. A. the earth had a solid shape.
5.
B. the earth didn’t have harmful
gases.
6.
C. the water stayed on the earth but
4. Can you sum up the main ideas of each paragraph?
Task two
In the last paragraph, we know humans face seriously global warming problem, which is threatening our existence. Can you write something to call on us to protect our environment ?
Timeline Several billion years after the “ big bang ”
between 4.5 and 3.8 billion years ago
Many millions of years later About 2.6 million years ago
Ok, next we will read the text according to time
□ Insects and amphibians appeared □ The earth became a solid ball □ Reptiles appeared. □ The earth was a cloud of dust. □ Shellfish and other fish appeared. □ Clever animals with hands and feet appeared.
We hope our earth will become more and more beautiful.
Homework
1. Learn the new words by heart 2. Listen to the recording of the text, and paraphrase the difficult sentences in the text.
Para 5 Answer question
About 2.6 million years ago
NBaidu Nhomakorabeaw
After the clever animals (humans) became important on the earth, what happened?
Humans produce too much carbon dioxide , making the earth too hot to live in.
例文
The earth we live in is becoming more and more terrible, so we must take measures to deal with it Firstly, the government should pass laws to prevent people and factories from polluting the environment. Secondly, everyone should realize the importance of the problem and try their best to protect the environment and fight against pollution. Besides, it’s a good ideas to plant trees to improve the environment.
Tip:
Firstly, you can find the key words of each paragraph
Para. 1 Para. 2 Para. 3
Para. 4 Para. 5
The formation(形成) of the earth. The importance of water for life. A widely accepted theory about the formation of the universe. The arrival of humans and their impact on the earth. The development of plants and animals on the earth.
Para 4
The first small plants on the surface of the water produced_o_x_y_g_e_n_ .
Many millions of years later
Early _sh_e_l_lf_i_sh_ and all sorts of fish appeared.
Careful reading
Task one
Read the text again, tell me how the author organizes the text?
According to time Ok, please quickly find the time from the text.
_g_r_e_en__p_la_n_t_s began to grow on land.
followed by_l_a_n_d_a_n_i_m_als, some are _i_n_s_e_c_ts_. others, called_a_m__p_h_i_b_ia_ns
Many millions of years later
Events
★
clever animals● humans
mammals●
reptiles● ●dinosaur
plants grow on the land● ●insects and amphibians
earth
small plants● ●shellfish and fish
water appears⊕ Big Bang⊕d⊕usstolid globe
Sample
The earth we live in is becoming more and more terrible, so we must take measures to deal with it
Firstly: Secondly: Thirdly:
We hope the environment will become more and more beautiful.
Fast reading
Answer the following questions.
1. How many paragraphs are there in the
text ?
2. What is the widely accepted theory in
Para 1?
3. Why was life able to develop on the earth
How life begin on the earth Big bang ??? The evolution of life on the earth ???
The text may tell us the ___________ of the earth and the ___________ of life on it.
Big Bang 4.5-3.8 many million billion years later
life
Time 2.6 Now million
Sum up
The text may tell us the _f_o_r_m_a_t_io_n___ of the earth and after __w_a_t_e_r__ appear, the _d_e_v_e_lo_p_m__e_n_t of life one after another on it.
□ Dinosaurs appeared. □ Small plants grew on the water. □ Plants began to grew on the earth. □ Water appeared on the earth. □ The universe begin with a “big bang” □ Mammals appeared.
高中英语必修三unitreading公开课
Unit 4 Astronomy
the science of the stars
Contents
Warming up Pre-reading Reading Sum up Consolidation Homework
WPraer-mreiandginugp
Task two Para 2
Several billion years after the “ big bang ”
between 4.5 and 3.8 billion years ago
The earth was still just _a_c_l_o_u_d_o_f__d_u_s_t. Then the dust settled into a _s_o_l_id__g_lo_b_e__. Then the earth became so _v_i_o_l_en__t _ and explode to produce its_a_t_m_o_s_p_h_e_r_e_.
Consolidation
Task one
Let’s listen to the recording of Para5, and then reading it loudly. You should pay attention to the pronunciation, intonation and tone.
谢谢大家！
right order of
development of life
on the earth? ? ?
If you want to
⑦
know more, pleas⑤e
turn to Page 25
Pre-reading
Look at title and the pictures. Can you get some information about what we will learn from the text ?
①
②
③
1
④
6
⑤
7
⑥
4
⑦
2
5
Let’s check whether we put
the right order at first.
Are you right?
3
Task three
Please read the text again, then put the order of these sentences. ( exercise 2, page 27)
When the plants grew into forests, r_e_p_t_il_e_s_appeared.
After that, some _h_u_g_e__a_n_im__a_l_s_, called dinosaurs developed.
The disappearance of dinosaurs made possible the rise of _m_a_m__m__als on the earth.