北师大英语必修1unit 2Lesson 4 Superhero课件

2 The arrival of _sm__a_ll__p_la_n_t_s _ encouraged the __d_ev_e_l_o_p_m_e_n_t_of early __sh_e_l_lf_is_h_a_n_d__a_ll_s_o_rt_s_o_f_f_is_h__. Many millions of years later _t_h_e_f_ir_s_t _g_re_e_n_p_l_a_n_ts__ began to appear __o_n__la_n_d__. Later _l_an_d__a_n_i_m_a_l_s _ appeared. Some were__in_s_e_c_ts__. Others called _a_m__p_h_ib_i_an_s_, were able to live on lands well as _i_n_t_h_e__se_a__. When the plants grew into forests, _d_i_n_o_sa_u_r_s_appeared for the first time. After they disappeared, _m__a_m_m__a_ls_became more important. They were the last group of animals different from because they __p_ro_d_u_c_e_d_milk from within their bodies.
Based on the article, make up a dialogue about “A visit to the moon” ， and perform the conversation in class. (10 mins) Characters: “I” , Li Yanping (Li)
earth now to feel its __p_u__l_l __," he explained, "so we feel as if there is no gravity at
all. When we get closer to the moon, we shall feel its gravity pulling us, but it will no
because we were trying to escape the pull of the earth’s __g_r_a_v__it_y__. It was so hard that we could not say anything to each other. Gradually the weight _l_e_s_s_e_n__e_d_ and
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BOOK 3 UNIT4: ASTRONOMY : THE SCIENCE OF THE STARE
READING: A VISIT TO THE MOON
学习目标
1.通过预习案中词汇、短语的复习，我们将为课堂内容的学习 做好准备。
2. 通过运用思维导图对第一篇文章进行口头、笔头复述，我们将 复习并巩固课文内容，为第二篇文章的学习做好准备。
04
当堂检测
Listen to the tape, and fill out the blanks.
Last month I was lucky enough to have a chance to make a trip into space with my friend Li Yanping, an _a_s_tr_o_n_o_m__e_r. We visited the moon in our spaceship! Before we left, Li Yanping explained to me that the force of gravity would change t hree times on our journey and that the first change would be the most powerful. Then we were off. As the rocket rose into the air, we were pushed back into our seats
earth and fell over. "Oh dear," I cried, "walking does need a bit of practice _n_o_w__t_h_at
gravity has changed." After a while I __g_o_t__t_h_e__h_a__n_g__o_f____it and
I was able to talk to him. "Why is the spaceship not falling back to the earth? On the earth if I fall from a tree I will fall to the ground." I asked. "We are too far from the
C
exercise on page 60 in your exercise books.
4 Group-work (Careful reading)
Discuss the following questions in the group and fill in the blanks.
Q1 How many times did the force of gravity change on their journey? When? How? What about their weight?
3. 通过独立思考、小组合作、课堂讨论、课堂展示等环节，我们 将了解文章大意。
4. 通过“挖词填空”这一环节，我们将复习巩固课堂内容。
01
预习案
Key expressions
天文学家___a_s_t_r_o_n__o_m__e_r___ 宇宙飞船___s_p_a_c_e__s_h_i_p_____ 减少；减轻_____le__s_s_e_n_____ 小屋；船舱____c_a_b_i_n______ 感到高兴____c_h_e__e_r_u__p_____ 熟悉；掌握__g_e__t_t_h_e__h_a__n_g__o_f_
“I”:_______________________________________________________________________ Li: _______________________________________________________________________ “I”: ______________________________________________________________________ Li: _______________________________________________________________________ …….
2 Lead-in
ager for an experience without gravity?
Shall we go together with Li Yanping?
3 Scanning &Skimming
A
Read the passage by yourself, and tryAB to finish the
After the _“_B_ig__B_a_n_g”_, the earth was a cloud of ____d_u_s_t ___. Later the dust began to __co_m__b_in_e into_a__ba_l_l _. And then it _e_x_p_lo_d_e_d_ loudly with fire and rock , which were in time to __p_r_od_u_c_e__ the water vapour , carbon dioxide, …which were to make the earth’s ___a_t_m_o_sp_h_e_r_e_. As the earth _c_o_o_le_d__ down, _w_a_te_r_ began to _a_p_p_e_a_r__ on its surface. Water had ___d_is_a_p_pe_a_r_e_d_ from planets or satellites, but it __s_ta_y_e_d_on the earth. That made it possible for life to begin to _d_ev_e_lo_p_ .
the moon larger.
When we got there, I wanted to explore immediately. "Come on," I said. "If you are right, my weight will be less than on the earth because the moon is smaller and I will be able to move more freely. I might even grow taller if I stay here long enough. I shall certainly weigh less!" I laughed and climbed down the steps from the spaceship. But when I tried to step forward, I found I was carried twice as far as on the
t be as strong a pull as the earth's." I_c_h_e_e_r_e_d__u_pimmediately and floated weight-