2020届一轮复习人教版必修三Unit4Astronomy-the science of star

2020届一轮复习人教版必修三Unit4Astronomy-the science of stars单元学案

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If you watch the sky about an hour after the sun goes down, you may see some “moving stars”．But they're not real stars.They are man-made satellites.And the biggest of all is the International Space Station (ISS国际空间站)．

From now until July is the best season to watch the ISS flying over the earth, and people can see it just with their eyes.The ISS is the biggest man-made satellite because scientists want to live on

it.They think that the best way to learn more about space is to live there.

When the space station is finished, it will be like a city in space.People will stay and study there with many of the things they have at home.Laboratories, living rooms and power stations are being built.

The ISS is the most ambitious and expensive space program ever.Billions of dollars are being spent on it every year.Scientists hope that the ISS will be a stepping-stone for future space

exploration.“The ISS will help us better understand the human body, explore space and study the earth.It can help us make life on the earth better，” said Kathryn Clark, an ISS scientist.

China is not an ISS country, but it has helped with some of the experiments.China sent some rice up to the ISS to find out what space would do to it.

The ISS is not finished yet.More than 100 parts need to be put on.Scientists hope it will be finished as soon as possible. After it's finished, more than 90% of the world's population will be able to see the Space Station.So keep looking up, and maybe you'll see it get bigger. Section_Ⅰ Warming__Up_&_Reading_—_Pre-reading

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HOW LIFE BEGAN ON THE EARTH

No one knows exactly how the earth began, as it happened so long ago①.However, according to② a widely accepted③ theory④， the universe began with⑤ a “Big Bang⑥” that threw matter in all directions⑦.After that, atoms⑧ began to form and combine to create stars and other bodies.

For several billion⑨ years after the “Big Bang”， the earth was still just a cloud of dust⑩.What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe?.The earth became so violent? that it was not clear whether the shape would last or not?.It exploded loudly with fire and rock.They were in time to? produce carbon dioxide?， nitrogen?， water vapour? and other gases, which were to make the earth's atmosphere?.What is even more important is that as the earth cooled down?， water began to appear on its surface.

①as it happened so long ago是as引导的原因状语从句。 ②according to“根据”，后跟名词、代词等，不跟me, us, view, opinion等词。 ③widely accepted广泛接受的 ④theory/'θI?rI/ n．学说；理论

⑤begin with (＝start with) 从……开始，起源于 ⑥Big Bang宇宙大爆炸；创世大爆炸

⑦in all directions (＝in every direction)朝四面八方

⑧atom/'?t?m/ n．原子

⑨billion/'bIlI?n/pron.&n.&adj.〈英〉万亿；〈美〉十亿 ⑩a cloud of dust一团尘埃

a cloud of 一般用来修饰不可数名词。 ?globe/ɡl??b/ n．球体；地球仪；地球 global/'ɡl??bl/ adj.全球性的；全世界的

?violent/'vaI?l?nt/ adj.猛烈的；激烈的；强暴的 ?it为形式主语，whether从句为真正的主语。

?in time to do sth./for sth.及时做某事；来得及做某事 in time及时；终于

?carbon dioxide二氧化碳 carbon/'kɑ?b?n/ n．碳 dioxide/daI'?ksaId/ n．二氧化物 ?nitrogen/'naItr?d??n/ n．氮 ?water vapour 蒸气；水蒸气 vapour/'veIp?/ n．水蒸气；蒸气

?atmosphere/'?tm?sfI?/ n．大气层；气氛 ?cool down 凉下来，冷却 地球上生命的起源 [第1～2段译文]

没有人确切知道地球是怎样开始的，因为在很久以前它就形成了。然而，根据一种普遍为人们所接受的理论，宇宙起源于一次大爆炸，这次大爆炸将物质投射到四面八方。然后，原子开始形成并结合成恒星和其他天体。

大爆炸后好几十亿年过去了，地球还只是一团尘埃。(随后)它变成什么没人确定，直到45～38亿年前，这团尘埃才慢慢地形成一个固态的球体。地球变得如此激烈动荡，以至于不知道这个固体形状是否会继续存在下去。它(地球)猛烈的爆炸喷出了烈火和岩石，最终产生了二氧化碳、氮气、水蒸气和其他气体，从而形成了地球的大气层。更重要的是，随着地球冷却了下来，地球的表面开始出现了水。

Water had also appeared on other planets like Mars but, unlike? the earth, it had disappeared later.It was not immediately obvious that water was to be fundamental○21 to the development of life○22.What many scientists believe is that the continued presence of water○23 allowed the earth to dissolve○24 harmful○25 gases and acids○26 into the oceans and seas.This produced a chain reaction○27， which made it possible for life to develop.

Many millions of years later, the first extremely small plants began to appear on the surface of the water.They multiplied○28 and filled the oceans and seas with oxygen○29， which encouraged○30 the later development of early shellfish○31 and all sorts of fish.Next, green plants began to grow on land.They were followed in time by land animals.Some were insects.Others, ○32called amphibians○33， were able to live on land as well as○34 in the water.Later when the plants grew into forests, reptiles○35 appeared for the first time.They produced young generally by laying eggs○36.After that, some huge animals, called dinosaurs○37， developed.They laid eggs too and existed○38 on the earth for more than 140 million years.However, 65 million years ago the age of the dinosaurs○39 ended.Why they suddenly disappeared○40 still remains a mystery.This disappearance made possible the rise of mammals○41 on the earth.These animals were different from all life forms in the past, because they gave birth to○42 young baby animals and produced milk to feed them.

?unlike/?n'laIk/ prep.与……不同；不像

○21fundamental/?f?nd?'mentl/ adj.基本的；基础的 be fundamental to是……的基础

○22It was not immediately obvious that ..., it为形式主语，that …… 此处隐藏：2717字，全部文档内容请下载后查看。喜欢就下载吧 ……