Unit 4 Astronomy: the science of the stars Using language 课件（24张）

课件24张PPT。必修三 Unit4Astronomy： the science of the starsUsing Languagea visit to the moonReading 2spaceship pull float gravity escape weightn. 宇宙飞船 n.&vt. (拉）力；拖；牵引力 vi.&vt. （使）浮动或漂浮 n. 漂浮物 n. 万有引力；重力 vi. & vt. 逃脱；逃避 n. 重量；体重 cheer up now that break out watch out (for…) escape doing … 感到兴奋；感到高兴 既然 突发；爆发 密切注视；当心；提防 逃避做…spacewalk★Look at the pictures! ★Man-made satellite Para11. Who do I have a chance to travel to the moon with ? 2. How did we travel to the moon?Li Yanpin , an astronomerby spaceshipRead Para.2 and 3; fill in the form.very strongdisappearedvery lightvery heavyno weight and could float around like a featherabout one-sixth of his weight on the earthPara.4 Returning to the earthBecause fire broke out on the outside of the spaceship as the earth’s gravity increased.1.Why was returning to the earth very frightening?2.How did I feel?I was very exhausted but very excited too.Language points1 …because we are trying to escape the pull of the earth’s gravity. pull n.拉；拖；扯 He gave a pull on the rope. 他拉了一下绳子。 (自然）引力 the moon's pull on the sea 月球对海洋的引力2. I cheered up immediately and floated weightlessly around in our spaceship cabin watching the earth become smaller and the moon larger. cheer up:使感到振奋, 感到高兴 She tried to cheer up the disappointed child when he failed to win the game. float: 浮动，漂浮 Wood floats on water. 木头漂浮在水上。 A feather floated down on the wind. 一根羽毛随风飘落。 float off (搁浅的船)浮起1). “A + be + 倍数 + as +形容词原级 + as + B”. This tree is three times as tall as that one. His father is twice as old as he. 2). “A + be + 倍数 +形容词比较级 + than + B ” 3. But when I tried to step forward, I found I was carried twice as far as on the earth and fell over. The Yangtze River is almost twice longer than the Pearl River. 长江差不多比珠江长两倍。 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。 3). “A + be + 倍数 + the +名词 (size, length, amount) + of + B” The newly broadened 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。 4. Walking does need a bit of practice now that gravity has changed. now that, 既然 Now that I am free, I can enjoy music for a while.? 既然有空，我可以享受一下音乐。 now that同since相似，语气较弱，强调人 们已知的事实。 5. We watched, amazed as fire broke out on the outside of the spaceship as the earth’s gravity increased. break out 它与happen, take place, come out等词是不及物动词，不能带宾语，不能用于被动语态。 1) 战争爆发 　　The American Civil War broke out in 1861. 美国内战爆发于1861年。 2) 发生争吵 　　A quarrel broke out between them. 他们之间发生了争吵。3) (火灾)发生 　 A?fire?broke?out?in?his?house?last? night.? 昨晚他家里失火了。 与break相关的短语: break down 打破; 毁掉; 破除; 坍塌; 坏掉 break in 破门而入; 打断break away from 脱离政党; 打破陈规 break throug ... ...