B3U4 Astronomy the science of the stars language points导学案
B3U4 Astronomy the science of the stars
高考：必考知识梳理B3U4 Astronomy: the science of the starsPart A.听写检测 (50 points)Ⅰ.Listen and write down the words you hear. (20 points)Ⅱ.Listen and write down the phrases, and then translate them into Chinese. (20 points)Ⅲ.Listen and write down the sentences.(10 points)Part B. 常考点检测 (50 points)Ⅳ.Write down the Chinese meaning of the underlined words. (15 points) 1. In our solar system eight planets circle around the sun.2. Each religion and culture has its own ideas about how life began on earth.3. There are violent winds of 120 kilometers per hour or more, which cause huge waves, heavy rain and floods.4. The world exists , whether you like it or not.5. We have launched another man-made satellite , which is announced intoday’s newspaper.Ⅴ.Check (√) the English meaning of the underlined words.(15 points)1.The small plants multiplied and filled the oceans and seas with2.My mother spoke to me in her gentle, loving voice, telling me that I could walk again. (determined/ soft)3.Sadly, many species have become extinct and many are in danger of extinction. (dead/ active)4.He crashed into the other youth and they both landed on the ground. (met /hit)5.Burning coal causes serious air pollution and increases global warming.(the earth’s / solar system’s)Ⅵ.Translation. （20 points）1.空气污染会加剧，这会对们造成危害。
新人教版 Book 3 Unit 4 Astronomy -- the science of the stars 课文
Unit 4 Astronomy: the Science of the StarsPart I How Life Began on the EarthNo one knows exactly how the earth began, as it happened so long ago. However, according to a widely accepted theory, the universe began with a “Big Bang” that threw matter in all direction s. After that, atoms began to form and combine to create stars and other bodies.For several billion years after the “Big Bang”, the earth was still just a cloud of dust. What it was to become was un certain until between 4.5 and 3.8 billion years ago when the dust settle d into a solid globe. The earth became so violent that it was not clear whether the shape would last or not. It explode d loudly with fire and rock. They were in time to produce carbon, nitrogen, water vapour and other gas es, which were to make the earth’s atmosphere. What is even more important is that as the earth cool ed down, water began to appear on its surface.Water had also appeared on other planet s like Mars but, unlike the earth, it had disappear ed later. It was not immediately obvious that water was so fundamental to the development of life. What many scientists believe is that the continue d presence of water allow ed the earth to dissolve harmful gases and acids into the oceans and seas. This produced a chain reaction, which made it possible for life to develop.Many millions of years later, the first extremely small plant s began to appear on the surface of the water. They multiplied and fill ed the oceans and seas with oxygen, which encourage d the later development of early shell fish and all sorts of fish. Next, green plants began to grow on land. They were followed in time by land animals. Some were insect s. Others, called amphibians, were able to live on land as well as in the water. Later when the plants grew into forest s, reptiles appeared for the first time. They produced young generally by lay ing eggs. After that, some huge animals, called dinosaurs, develop ed. They laid eggs too and exist ed on the earth for more than 140 million years. However, 65 million years ago the age of dinosaurs end ed. Why they suddenly disappear ed still remain s a mystery. This disappearance made possible the rise of mammals on the earth. These animals were different from all life form s in the past, because they give birth to young baby animals and produce milk to feed them.Finally about 2.6 million years ago some clever animals, now with hands and feet, appeared and spread all over the earth. Thus they have, in their turn, become the most important animals on the planet. But they are not looking after the earth very well. They are putting too much carbon dioxide into the atmosphere, which prevent s heat from escap ing from the earth into space. As aresult of this, many scientists believe the earth may become too hot to live on. So whether life will continue on the earth for millions of years to come will depend on whether this problem can be solve d.Part II a Visit to the MoonLast month I was lucky enough to have a chance to make a trip into space with my friend Li Yanping, an astronomer. We visited the moon in our spaceship!Before we left, Li Yanping explain ed to me that the force of gravity would change three 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 push ed back into our seats because we were trying to escape the pull of the earth’s gravity. It was so hard that we could not say anything to each other. Gradually the weight lessen ed and I was able to talk to him. “Why is the spaceship not fall ing 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 earth now to feel its pull,” he explained. “So we feel as if there is no gravity at all. When we get closer to the moon, we shall feel its pulling us, but it will not as strong a pull as the earth’s.”I cheer ed up immediately and float ed weightlessly around in our spaceship cabin watching the earth become smaller and the moon larger.When we got there, I wanted to explore immediately. “Come on,” I said. “If you are right, my mass 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 step s from the spaceship. But when I tried to step forward, I found I was carried twice as far as on the earth and fell over. “Oh dear,” I cried, “walking does need a bit of practice now that gravity has changed.” After a while I got the hang of it and we began to enjoy ourselves.Leaving the moon’s gravity was not as painful as leaving the earth’s. But return ing to the earth was very frighten ing. We watched, amazed as fire broke out on the outside of the spaceship as the earth’s gravity increase d. Again we were push ed hard into our seats as we came back to land. “That was very exhaust ing but very exciting too,” I said. “Now I know much more about gravity!” Do you think we could visit some stars next time?”“Of course,” he smile d, “which star would you like to go to?”。
必修3 Unit 4 Astronomy： the science of the stars
【本讲教育信息】一、教学内容必修3 Unit 4 Astronomy: the science of the stars（一）重点单词（二）重点短语（三）重（难）点句型二、知识精讲（一）重点单词1. system n.[c] 系统；体系；制度systematic adj.He created a new system of teaching foreign languages.他创造了一种新的外语教学体系。
The new system has had a disastrous effect on productivity.新制度对生产率产生了灾难性的影响。
Too much alcohol is bad for the system.过量饮酒对身体有害。
theory n.学说；理论theoretic adj.There are many theories about the origin of life.关于生命起源的学说有很多。
In this way they can better apply theory to practice.这样他们就能更好地把理论运用到实践中去。
Your plan sounds fine in theory it doesn’t work in practice.你的计划在理论上听起来不错，但在实践中无法实施。
2. violent adj. 猛烈的；激烈的；粗暴的violence n.They are launching a violent attack on the enemy.他们对敌人展开了猛烈的进攻。
The class was shocked by his violent language.全班同学对他激烈的言辞感到震惊。
Children should not be allowed to watch violent movies.不应允许儿童看暴力电影。
The young man was charged with robbery with violence.这个年轻人被控暴力抢劫。
必修三 Unit 4 Astronomy：the science of the stars
必修三Unit 4 Astronomy：the science of the stars肥城一中李大刚Words【学习目标】1、课前预习、记忆单词，能够会读、会写。
2、通过查字典、小组合作探究，掌握单词、词组的用法。
【重点难点】1、重点单词: system, theory, violent, unlike, fundamental, harmful, multiply, exist, puzzle, crash,pull, float2、重点短语：in time, lay eggs, give birth to, in one’s turn, prevent…from, block out, cheer up, nowthat, watch out for ,break out【自主学习】The classification of parts of speechv. multiply , exist, puzzle ,crash, pull , floatn. astronomy , system , religion , theory , atom , billion , globe , carbon , dioxide , atmosphere , acid,chain, oxygen, puzzle, biology, gravity, satellite, physicist, climate, spaceship,adj. violent, fundamental , harmful , gentle,unlikeprep. unlike【合作探究】1. astronomy n. 天文学astronomer天文学家2. system n.[c] 系统；体系；制度；方法systematic adj. 有系统的; 有条理的1) The solar system (太阳系)includes the sun and its eight planets.太阳系包括太阳和它的八颗行星。
高三英语必修三Unit4 Astronomy：the science of the stars ——天文学：恒星科学
3. puzzle vt.& vi.(使)迷惑;(使)为难;(使)窘困;感到迷惑 n．(游戏的)猜谜;难题;谜 (2019·高考江西卷·阅读理解A)But his curiosity was
difficult to control and this new computer really puzzled him. 但是他难以抑制自己的好奇心,并且这台新电脑确实 让他很迷惑。 归纳拓展 (1)puzzle sb.使某人为难 be puzzled by 被……迷惑 puzzle about/over sth.苦苦思索;仔细琢磨 (2)be in a puzzle about sth.对某事迷惑不解 (3)puzzling adj. 令人困惑的 puzzled adj. 感到困惑的
目录
考点串讲讲练互动
[单词精研] 1. exist vi. 存在,生存 (教材P26)They laid eggs too and existed on the earth for more than 140 million years. 它们也生蛋,在地球上生存了一亿四千多万年。 归纳拓展
exist in...存在于……之中 (1)exist on...靠……为生
一个人的智力极限通常来说出生时就已经定型了但他是否能够达到这些极限则取决于他的生活环境
Unit 4 Astronomy：the science of the stars ——天文学：恒星科学
本节目录
基
考
础
点
盘
串
点
讲
自
讲
测
练
自
互
评
动
基础盘点自测自评
[核心单词] 1．__a_s_t_r_o_n_o_m_y____ n．天文学 2． __s_y_st_e_m________ n．系统;体系;制度 3． __t_h_e_o_r_y_______ n．学说;理论 4． _a_t_m__o_sp__h_e_re____ n．大气层;气氛 5． _f_u_n_d_a_m__e_n_t_a_l __ adj.基本的;基础的 6． _t_h_u_s______ adv.因此;于是 7．__a_to_m____ n．原子
必修3 Unit4 Astronomy the science of the stars[Warming up and reading]
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6.amphibians（两栖类）
Study of the groups of life (生命的种类/物种) Look at the pictures and tell the groups . 1.insects
2.plants
3.reptiles（爬行类）
4.shellfish（贝类）
5.fish 7.mammals(哺乳类)
6.amphibians（两栖类）
Study of the groups of life (生命的种类/物种) Look at the pictures and tell the groups . 1.insects
2.plants
3.reptiles（爬行类）
4.shellfish（贝类）
5.fish 7.mammals(哺乳类)
Chinese geography
English
mathematics physics
biology
history politics
chemistry
physics
mathematics
Science subjects
biology
chemistry
geography
Warming up
water
insects and amphibians Small plants land on
Reptiles on land
dinosaurs
mammals
advanced mammals
Careful-reading
1.Why the earth was different after the water appeared? 2.Why did plants grow before animals? 3.Why did animals first appear in the sea not on the land? 4.What is the main difference between reptiles and mammals?
Unit 4 Astronomy the Science of the Stars (B 3)
Unit 4 Astronomy: the Science of the Stars (B 3) Section 1 Warming Up, Reading & Comprehending重点知识精讲一、重点单词1. science n.⑴[U] 科学；自然科学the law of science 科学规律new developments in science technology 科学技术的新发展⑵[C;U] 自然科学学科to study one of the science 攻读一门自然科学⑶[sing] （尤指人文、社会）学科；学Is there an adequate basis for a science of international policies. 国际政治作为一门学科是否有足够的基础。
【知识拓展】scientific adj. 科学（上）的；关于科学的；有系统的；有条理的scientist n. 科学家scientifically adv. 科学上；合乎科学地science fiction 科幻小说（或影片等）science park 科技园区2. system n.⑴（思想或理论）体系；方法；制度；体制He wrote an article on the British educational system. 他写了一篇关于英国教育制度的文章。
What do you think of the new system for assessing personal tax bill? 你认为这种新的个人税收评估制度怎么样？⑵系统The transport system needs to be improved 运输系统需要改进。
【知识拓展】systematic adj. 系统的；成体系的；有条理的systematically adv. 有步骤地；成体系地；系统地systematize vt. 使系统化；使成体系the system 沿袭已久的方法、做法或规则get sth. out of one’s system 宣泄；排解；消解（强烈的感情或欲望）3. violent adj.⑴使用暴力的；暴力引起的（尤指非法的）Students were involved in violent clashes with the police. 学生和警察发生了暴力冲突。
b3unit4 astronomy
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第14讲
Unit 4
Astronomy：the science of the stars
(3)Every possible means should be taken to prevent the being polluted river from _______________. 应该采取各种可能的措施来防止这条河流受到污染。
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第14讲
Unit 4
Astronomy：the science of the stars
Ⅱ.短语检测 lay eggs 1．下蛋 ________________ watch out 2．密切注视；当心；提防 _______________ now that 3．既然 _______________ give birth to 4．产生；分娩 _______________________
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第14讲
Unit 4
Astronomy：the science of the stars
3．But when I tried to step forward, I found I was carried ________________ on the earth and fell over. twice as far as 但是当我努力向前迈步的时候，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。 whether life will continue the earth for millions of 4．So ____________________on years to come will depend whether this problem can be solved on______________________________. 所以， 在未来的数百万年中， 生命能否在地球上延 续取决于这个问题能否得到解决。 5．As a result of this event, a great dust cloud formed in the sky__________________________. blocking out the sunlight 由于这件事，在天空中形成一大团尘埃遮住了阳光。
人教版高中英语必修3：unit 4 Astronomy_ the science of star
Unit 4 Astronomy
The science of the stars 关于星星的科学
主讲： 学校：
Solar system On which planet are there
lives at present ?
earth
HOW LIFE BEGAN ON THE EARTH
Age(dinosaur)ended
plant
water
Reptiles Plants
Insects and amphibians
Plants grow on land
Earth (solid globe) atmostphere
Dinosaurs
Mammals (including humans )
The developmnt of the earth
WeChat of the earth
EARTH
The universe bloengagnawgitoh a “Big Bang”
EARTH
Stars aanfdteotrhetrhbeodBieigs wBearnegformed
EARTH
EARTH
Wataesr btheegaenatrothapcpoeoalreodndtohwe enarth
EARTH
PlManilltisonbseogfayneators garfotewr wateirn’s wapapteearrance
EARTH
The age6o5fmdiinlloiosanuyrseeanrdseadgo
FSakstimremaidnigng
What’s the text about?
人教高中英语必修3 Unit4 Astronomy the science of the stars
How to breathe
What to dress
Problems
What to eat
How tWater system
5.Right engine
4. Left engine 6.Tool kit 3.Gravity boots
Please look at/ listen to… You need… Please pay attention to… You’d better… Make sure you… You must(n’t)…
Stephen Hawking
1. I heard about how three men made mistakes when they tried to describe gravity.
2. I heard about how three men wanted
to find out about the beginning of the universe. 3. I heard about how the idea of gravity has developed over a long period of time. 4. I heard about three scientists and their work.
Homework
1. Search the Internet for the information of the development of life.
2. Read and learn good words, phrases or structures from Reading.
Period 2
Astronomy
Astronomy is the scientific study of the universe and the heaven bodies (such as the sun, the moon, and stars), gas, and dust within it.
高考英语 Unit 4 Astronomy the science of the
闪堕市安歇阳光实验学校Unit 4 Astronomy：the science of the starsⅠ.单项填空1．________a certain doubt among the workers as to the necessity of the work.A．It existed B．There existedC．There had D．It had解析句意：对于做这份工作的必要性，工人们存在一定的疑惑。
There exists/existed...有；存在；相当于There be....结构。
答案B2．When the young man came back，tired，he just forgot to turn on the radio and____missed the program.A．anyhow B．thusC．however D．somewhat解析句意为：这年轻人回来时，累了，他就忘了打开收音机，因而错过了那个节目。
anyhow不管怎样；thus如此；因此；这样；从而；however然而；somewhat 稍微；有点。
答案B3．—Darling，I didn't get promoted.—________！There will be loads of other opportunities.A．Well done B．What a pityC．Cheer up D．All right 解析答语句意：振作起来！还会有很多其他的机会的。
cheer up振作起来；well done做得很好；what a pity真遗憾；all right好。
答案C4．The police arrived twenty minutes later and________the crowd for the sake of safety.A．took up B．wound upC．woke up D．broke up解析考查动词短语。
必修三unit4 Astronomy the science of stars
F 6. Then mraemptmileasls began to rise. T 7. At last, human beings came and spread all over
Unit 4 Astronomy: the science of the stars
By Tian Rui Xiang
Venus 金星 Earth 地球
Mars 火星
Mercury 水星
Jupiter 木星 Saturn 土星 Uranus 天王星
Neptune 海王星
The names of eight planets.
Let’s check your memory and understanding of the text!
(个人抢答竞赛)
Para. 2
What made up the earth atmosphere?
_c_a_r_b__o_n__, _n__i_tr_o__g_e_n_, _w__a_t_e_r__v_a_p__o_u_rand o_t_h__e_r_g__a_s_e_s_ made up the earth atmosphere.
1) 水星 2) 金星 3) 地球 4) 火星 5) 木星 6) 土星 7) 天王星 8) 海王星
• Mercury • Venus • Earth • Mars • Jupiter • Saturn • Uranus • Neptune
Reading : How Life Began on the Earth
appeared on the surface of water.
F 2. Then, the esxhterlelmfisehly&smfiashll plants developed. T 3. Next, green plants began to grow on land. F 4. Later, mraemptmileasls appeared for the first time. T 5. After that, dinosaurs developed, but they
高考英语总复习必修三Unit 4 Astronomy the science of the star
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2.“动词＋out”短语荟萃
①block out
挡住(光线)
②break out
突发；爆发
③find out
查出；弄明白
④look/watch out 当心；提防
⑤put out
扑灭
⑥run out
用完
⑦let out
泄露；发出(声音)
⑧die out
灭绝
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(三)仿写用活句式——造佳句·表达高
1． system n．
系统；体系；制度
2． religion n.
宗教；宗教信仰
3． theory n.
学说；理论
4． violent adj. 5． atmosphere n.
猛烈的；激烈的；强暴的 大气层；气氛
6． unlike prep.
与……不同；不像
7． fundamental adj. 基本的；基础的
先写对
及时；终于 阻止；制止 既然 感到高兴；感到振奋 下蛋 产生；分娩
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再用准
①Now that we all understand that the haze is harmful to our health, we should take effective measures to ②prevent it from getting bad to worse. No matter what happens, we must ③ cheer up and try to reduce the pollution. If we keep on, we'll succeed ④ in time .
返回
第二组
先写对
1. in one's turn
必修3 Unit4-Astronomy-the science of the stars
数学 低段
必修3 Unit 4 exist P106
页码12
exist
数学 低段
(2) True creativity is the ability to take something existing (exist) and create something new from it. （2014·全国Ⅰ卷改编）
解析：
（2014·天津卷改编）
句意：生活就像海洋：只有意志坚强的人才能到达彼岸。
必修3 Unit 4
(5) We move away from people and things that we dislike or that make
unlike P105
写作小积累：远离
us anxious.
（2014·江苏卷改编）
potatoes, corns, onions and carrots. （2015·四川卷编）
解析： 句意：爸爸拿出一个高压锅，在里面装满卷心菜、茄子、西红
必修3 Unit 4 pull P106
柿、玉米、洋葱和胡萝卜。
页码19
pull
数学 低段
(2) I pulled over and picked the elderly man up. I made him comfortable on the back seat and offered him some water. （2013·陕西卷改编）
P106
the night.
（2014·天津卷编）
解析：
考查词性转换。通过分析句子结构可知，空格出现于系动词之后
作表语，故需填提示词的形容词形式。空格处修饰“我”，此处
应表示“感到困惑的”，故答案为puzzled。句意：我很困惑，这
Unit4 Astronomy the science of the stars鍚屾
英语知识点优化训练：Unit4 Astronomy：the science of the Stars该优化训练是针对新人教版必修3的Unit4 Astronomy：the science of the Stars出题的，主要考察学生的基础知识，从单词填空、单项选择、完型填空和阅读理解等方面进行考察，难度适中。
ⅠFill in the blank with the words we learned. Then learn the sentences well.1 Hawking is one of the most famous ___________(physic) in the world.2 ____________(like) China, Australia is in Winter when China is in summer.3 The young man speaks ________(gentle) and everyone likes him.4 There is too much ____________(violent) on TV which is bad for the health of the young.5 Some factories produce __________(harm) gases, which pollutes our _________(大气层).6 The __________(气候) is very pleasant in Kunming all the year round. w.w.w.g.k.x.x.c.o.m7 The discovery of __________(重力) is so important for science.8 We can see live programs from America because of man-made ___________(卫星)9 We are trying to build a better social ____________(体系).10 Though the __________(理论) was not right, it affects many people at that time.Ⅱ语法：主语从句(Subject Clause)：位于句首充当主语的从句。
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Step3 Homework
1) The little boy was glad to see the cake his parents bought for him was _______what he had expected.(2012· 河北) A. twice size of B. twice the size of C. twice of the size D. the twice size of 2) ----I'm thinking of the test tomorrow，I'm afraid I can't pass this time. ----________! I’m sure you’ll make it. (2006· 天津) A. Go ahead B. Good luck C. No problem D. Cheer up 3) The couple had a _____ quarrel because of the housework and John rushed out angrily. A. violent B. harmful C. impressive D. unbelievable 4) Jenny nearly missed the flight _____ doing too much shopping. (09 全国) A. as a result of B. on the top of C. in front of D. in need of 5) In many parts of China, there still _____ the idea that boys are more important than girls. A. existence B. existed C. is existing D. exists 6) If we throw poisonous waste away without dealing with it, great harm will be ______ to our surroundings(环境). A. made B. done C. taken D. carried 7) He was________ for 3 months for careless driving. A. banned for driving B. prevented from driving C. kept driving D. stopped in driving 8) The ______expression on his face suggested that he was not able to work out the _____ problem. A. puzzling; puzzling B. puzzled; puzzled C. puzzling; puzzled D. puzzled; puzzling 9) ______ the term has come to an end, I am going to have a rest and take a trip. A. Now that B. Even if C. As though D. So that 10) ----Did you fall in love with that girl______ you met her? ----Yes. Now we lead a happy life. A. by the first time B. for the first time C. the first time D. first time
港南中学高一英语导学案
编号:3-4-4
主备人:吴静
审核人: 林晓扬
授课日期：
Title
Book3 Unit4 Language points 班别 高一_______ _______组 ______月_______日
姓名
Learning aims
1. To keep the important words in mind 2. To finish the following designed Exx and summarize the important usages 请熟读并记忆这些考纲词汇。 system, theory, violent , unlike, harmful, exist, Step1: Reading the words in time, give birth to, in one’s turn, prevent...from Step2: Vocabulary ( 阅读课文句子，体会斜体词的用法，完成下列习题， 并总结相关知识点)
2
港南中学高一英语导学案
编号:3-4-4
主备人:吴静
审核Байду номын сангаас: 林晓扬
授课日期：
A. twice as B. as twice C. twice much D. much twice 3) The new stadium being built for the next Asian Games will be _____ the present one.( 2011 陕西) A. as three times big as B. three times as big as C. as big as three times D. as big three times as Summary: 英语中常见的倍数表达方法有： (1)A＋be＋倍数＋as ＋形/副原级＋as＋B “A 是 B 的多少倍” (2)A＋be＋倍数＋形/副比较级＋than ＋B “A 比 B 大多少倍” (3) A＋be＋倍数＋the＋名词(size/weight/length...)＋of ＋B “A 是 B„的多少倍” Exx5 课文原句： We watched, amazed as fire broke out on the outside of the spaceship as the earth’s gravity increased. 1) He had to pause from time to time to wipe the sweat from his forehand, because the air-conditioning system_____.(2012 陕西) A. broke in B. broke up C. broke out D. broke down 2) I was talking with my monitor when a fight ___ between the students of the two classed.(13 湖北) A. blocked out B. hung out C. watch out D. broke out 3) You can't predict everything. Often things don't ______as you expect.(2011· 江西) A. run out B. break out C. work out D. put out Summary: break out 突发，爆发 break away (from)脱离；逃脱 break down 中止；分解；垮掉；(车辆等)抛锚 break off 中断；折断；突然停止 break up 打碎；分裂；解散 break in 突然闯入；打断 break into 破门而入；突然开始 break through 突围；突破 Exx6 : 课文原句：Walking does need a bit of practice now that gravity has changed. 1)._____ you want to improve your oral English, why not practise speaking English every day? A. So that B. Now that C .Such that D. In order that 2)._____you are familiar with the author's ideas，try reading all the sections as
Exx1: 课文原句：They were in time to produce carbon dioxide, nitrogen, water vapour and other gases. 1) The manager wants to see changes in the company, and I am sure he will _____.(2013 陕西) A. in particular B .in turn C .in charge D. in time 2) ----Thank God you’re safe. ----I stepped back, just _____ to avoid the racing car.(2012 江苏) A. in time B. in case C. in need D. in vain 3) ______ is smoking allowed here in the gas station. (2012· 杭州质检) A. At no time B. In no time C. At one time D. At time 4) I thought her nice and honest _____ I met her.(2010 上海) A. first time B. for the first time C. the first time D. by the first time Summary: in time (1)及时 in time to do sth./ for sth. (2)终于 on time 按时；准时 in no time 立刻；马上 at no time 绝不 at a time 每次；一次 at one time 一度；曾经 at times 有时 ahead of time 提前 for the first time “第一次” （介词短语） ，作时间状语 the first time “第一次”(名词短语)，作表语，或作连词引导时间状语从句 Exx2: 课文原句： Thus they have, in their turn, become the most important animals on the planet.