1、Unit 4 Astronomy: the science of the starsUsing language导学案1学习目标:1.To be able to read the passage by skimming and scanning.2.Master the important words and expressions in this period. 重点: Be able to use the important words and expressions in this period flexibly.课前预习案Previewing Case 使用说明及学法指导：1. 自我学
2、习课本30-31页里的内容,完成预习案。2. 完成时间25-30分钟。Task1 Write down the words and expressions according to the following Chinese meaning.I. 单词巩固1. v. 碰撞,坠落_ 仍是,剩下_ 允许_ 减少,减轻_浮动,漂浮_ 2. n. 生物学_ 卫星_ 物理学家_ 拉力,牵引力_重力_ 气候_ 宇宙飞船_ 3. adj. 极大的,强有力的_ 幸运的,好运的_温和的;文雅的_ II. 短语记忆1.挡住(光线)_ 2.连锁反应_ 3. 第一次_ 4.依靠,依赖于_ 5. 感到高兴_ 6. 既然
3、_7. 熟悉,掌握_ 8. 爆发_ Task 2 Read the passage on Page 30-31 and summarize the main idea:Last month I visited the moon with my friend. Before we left, I was told the force of would change ( ) times on our journey. Then we took off. As we left the earth, I became very( ),but gradually the weight ( ). When
4、 I was in space, it ( ). We( ) weightlessly in the cabin and I ( ). When I was on the moon, I was surprised to find even walking needs lots of practice ( ) gravity has changed. Returning to the earth was very ( ). We were amazed to watch fire ( ) on the outside of the spaceship.课堂探究案 Exploring CaseS
5、tep 1: Reading ComprehensionFast ReadingMatch the three ways in which gravity changed(1)Left the earth A. It became very light.(2)In space B. The gravity became very strong.(3)On the moon C. The gravity disappeared.Match the weight changed(1)Left the earth A. He is weightless.(2)In space B. He weigh
6、s less than on the earth.(3)On the moon C. His weight is normal. Careful ReadingRead the text carefully and choose the best answer:1. The passage is mainly about _? A. introduction of the moon B. the gravity that I felt on my way to the moon C. my visit to the moon D. my friend Yanping, an Astronome
7、r2. According to the text, we know that the force of the gravity would change _ times. A. 2 B. 3 C. 4 D. 53. When did the author feel strongest of the gravity of the earth?A. On the moon. B. On the half way to the moon.C. At the very beginning D. On their leaving from the moon4. What causes the writ
8、er to feel that he becomes weightless on the moon? A. Spaceship B. Gravity C. His friend D. His Good feelings of the moon5. From the text we can know if a man grows up on the moon, _. A. he will grow taller than on the earth B. he will grow shorter than on the earth C. he will become fatter D. he wi
9、ll become weightlessRead the text carefully again and fill in the blanks.Periods Details On leaving the earths atmosphere(Para 2)With the rocket rising into the air, we were into our seats because of the strong ( ) of the earths gravity. The ( ) lessened as we moved far away from the earth. When get
10、ting closer to the moon, we felt pulled by ( ), but it was not as strong as the earths.While landing on the moon(Para 3)We weigh ( ) than on the earth.While trying to step forward, I found I was carried as far as on the earth.It took a bit of ( ) to walk on the moon.When leaving the moon(Para 4)Leav
11、ing the moons gravity was less ( ) than leaving the earths.Returning to the earth was very ( ) because fire broke out on the outside of the spaceship as the earths gravity .We were pushed hard into our seats again when we came back to land.Step 2: Language Points1. When we get closer to the moon, we
12、 shall feel its gravity pulling us but it will not be as strong a pull as the earths. 当我们更接近月球时, 就会感到月球的引力在拉我们。但是, 月球的引力不像地球的引力那么大。The school is close to the post office.get close to 指 ( ) 变化be close to 指 ( ) as strong a pull as the earths 像地球的引力那么强大归纳：as+adj./adv.+as as+adj.+a/an+n.+as 表示：_1) He is
13、 as good a director as he is an actor. 2)He ( ) (和我游得一样快)。3)She is ( ) (当演员和当歌手都一样出色)。2.I cheered up immediately and floated weightlessly around in our spaceship cabin watching the earth become smaller and the moon larger.我立刻感到高兴起来,由于失重我在太空舱里飘来飘去,我望着地球越来越小,而月球越来越大。 cheer up: 1) _(人群欢呼起来) when they s
14、aw the team arrive.2)他带她去听音乐会来使她高兴。 3. But when I tried to step forward, I found I was carried twice as far as on the earth and fell over. 当我试着向前迈步的时候,我发觉我被送出去很远,步子的跨度竟是在地球上的两倍,因而我摔倒了。The number of students in our school is three times larger than that in theirs.我们学校的学生数量比他们学校的多三倍。The newly broadene
15、d square is four times the size of the previous one. 新扩建的广场是未扩建时的四倍大。twice as far as _three times larger than _our times the size of _归纳倍数的表达法：1) ( ) 2) ( ) 3) ( ) 这个房间是那个房间的三倍大。1) ( ) 2) ( ) 3) ( ) 4. . “walking does need a bit of practice now that gravity has changed.” .既然引力改变了,走路也的确需要练一练了。 now th
16、at 表示 ( ),同since相似,语气较弱,强调人们已知的事实。1)Now that youve grown up, you can decide it yourself.2)既然你有机会,就应该好好利用它。5.After a while I got the hang of it and we began to enjoy ourselves. 过了一会,我才掌握了走路的诀窍,这才开始感到自如了。got the hang of: 1) Ive been trying to ( ) this new typewriter. 我一直想掌握这部新的打印机的用法。2)现在我已经掌握了这个词的用法了
17、。_ Step 3 训练案:根据括号内的提示翻译下列句子。1.老师幽默的讲话让我们很振奋, 之后班里的气氛也轻松起来。(atmosphere; cheer up)_ 2.既然我们已经完成了设计, 就该由公司来进行建设了。(now that; in ones turn) _ 3.让我们十分失望的是, 战争最终在那两个国家之间爆发了。(to ones disappointment; break out) _ 4.长江差不多比珠江长两倍。(倍数表达法) _语法填空：Last month I made a trip into space with my friend Li Yanping. We vi
18、sited the moon in our spaceship. Before we left, Li Yanping explained _ me that the force of gravity would change three times on our journey and _ the first change would be the most_( power). Then we were off. As the rocket rose slowly into the air we began to feel _ pull of the earth, which is _ we
19、 called gravity. At first it pushed us _ hard back into our seats that we could not say anything to each other. _(gradual) the weight lessened and I was able to talk to him. _ we got closer to the moon, we felt its gravity pulling us but it was not as strong a pull as the earths. I cheered up immedi
20、ately and floated_(weight) around in our spaceship cabin_(watch) the earth become smaller and the moon larger. 参考答案课前预习案Task1 I. 单词巩固3) crash; remain; allow; reduce; float4) biology; satellite; physicist; pull; gravity; climate; spaceship5) powerful; lucky; gentleII. 短语记忆block out; chain reaction; f
21、or the first time; depend on; cheer up; now that; get the hang of; break outTask 2Gravity; three; heavy; lessened; disappeared; floated; cheered up; now that; frightening; break out.课堂探究案Step 1Fast ReadingMatch the three ways in which gravity changed(1)Left the earth A. It became very light.(2)In sp
22、ace B. The gravity became very strong.(3)On the moon C. The gravity disappeared.Match the weight changed4) Left the earth A. He is weightless.5) In space B. He weighs less than on the earth.6) On the moon C. His weight is normal. 1-5 CBCBA Read the text carefully again and fill in the blanks. pushed
23、 back; pull; weight; the moons gravity; less; twice; practice; painful; frightening; increasedStep 21.接近;距离;接近;状态;像A一样;(4)他当导演像当演员一样出色。(5)swims as fast as I(6)as good an actress as she is a singer2.高兴,欢呼; 1)The crowd cheered up 2)He took her to the concert to cheer her up3.两倍远;大三倍;四倍大;倍数+as+adj./adv
24、.(原级)+as;倍数+比较级+than;倍数+the size(height/length/width)+of;The room is three times as lager as that one.; The room is three times larger than that one.; The room is three times the size of that one.4.既然;1)既然你已经长大了,你可以自己决定了。2) Now that you have got a chance, you should make full use of it.5.掌握,精通; 1)ge
25、t the hang of2) Now I have got the hang of the usage of this word.Step 31. The atmosphere in the classroom relaxed after the teachers humorous talk cheered us up.2. Now that we have finished the design, the company will do the construction in its turn.3. To our disappointment, the war between the two countries broke out finally.4. Changjiang River is almost twice as long as Pearl River Changjiang River is almost twice longer than Pearl River. Changjiang River is almost twice the length of Pearl River.
