1、必修三 Unit4Astronomy： the science of the starsspaceshippullfloatgravityescapeweightn. 宇宙飞船宇宙飞船 n.&vt. (拉）力；拖；牵引力拉）力；拖；牵引力vi.&vt. （使）浮动或漂浮（使）浮动或漂浮n. 漂浮物漂浮物n. 万有引力；重力万有引力；重力vi. & vt. 逃脱；逃避逃脱；逃避n. 重量；体重重量；体重Words preview cheer up now that break out watch out (for)escape doing 感到兴奋；感到高兴感到兴奋；感到高兴 既然既然 突发；爆
2、发突发；爆发 密切注视；当心；提防密切注视；当心；提防逃避做逃避做spacewalkLook 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.On the earth In spaceOn the moonThe gravityTheweight
3、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 earths gravity increased.1.Why was returning to the earth very frightening?2.H
4、ow did I feel?I was very exhausted but very excited too.1 because we are trying to escape the pull of the earths gravity. pull n.拉；拖；扯拉；拖；扯 He gave a pull on the rope. 他拉了一下绳子。他拉了一下绳子。 (自然）引力自然）引力 the moons pull on the sea 月球对海洋的引力月球对海洋的引力2. I cheered up immediately and floated weightlessly around i
5、n our spaceship cabin watching the earth become smaller and the moon larger.cheer up:使感到振奋使感到振奋, 感到高兴感到高兴She tried to cheer up the disappointed child when he failed to win the game. float: 浮动，漂浮浮动，漂浮 Wood floats on water. 木头漂浮在水上。木头漂浮在水上。A feather floated down on the wind. 一根羽毛随风飘落。一根羽毛随风飘落。float of
6、f (搁浅的船搁浅的船)浮起浮起1). “A + be + 倍数倍数 + as +形容词原级形容词原级 + as + B”. This tree is three times as tall as that one. His father is twice as old as he.2). “A + be + 倍数倍数 +形容词比较级形容词比较级 + 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 Yangt
7、ze River is almost twice longer than the Pearl River. 长江差不多比珠江长两倍。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我们学校的学生数量比他们学校的多三倍。倍。 3). “A + be + 倍数倍数 + the +名词名词 (size, length, amount) + of + B” The newly broadened square is four tim
8、es the size of the previous one. 新扩建的广场是未扩建时的四倍大。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。既然有空，我可以享受一下音乐。 now that同同since相似，语气较弱，强调人相似，语气较弱，强调人 们已知的事实。们已知的事实。 5. We watched, am
9、azed as fire broke out on the outside of the spaceship as the earths gravity increased. break out 它与它与happen, take place, come out等词等词是不及物动词，不能带宾语，不能用于被动是不及物动词，不能带宾语，不能用于被动语态。语态。 1) 战争爆发战争爆发The American Civil War broke out in 1861. 美国内战爆发于美国内战爆发于1861年。年。 2) 发生争吵发生争吵A quarrel broke out between them.
10、他们之间发生了争吵。他们之间发生了争吵。3) (火灾火灾)发生发生 A fire broke out in his house last night. 昨晚他家里失火了。昨晚他家里失火了。与与break相关的短语相关的短语: break down 打破打破; 毁掉毁掉; 破除破除; 坍塌坍塌; 坏掉坏掉 break in 破门而入破门而入; 打断打断break away from 脱离政党脱离政党; 打破陈规打破陈规 break through 突围突围; 突破突破; 冲垮冲垮; 克服克服break up 打碎打碎; 拆散拆散; 分裂分裂; 分解分解break ones word/promise食言食言; 说话不算数说话不算数
