2020届一轮复习人教版必修三Unit4Astronomy-the science of star(16)

Our geography teacher says the earth is only one of the planets of the giant solar system.Unlike other planets, life exists on the earth, but life's origin is still a puzzle.Different religions and cultures have separate ideas.The teacher says it may be divided into four stages.

The first stage is about how the universe began.A widely accepted theory can explain it.After the “Big Bang” broke out, atom began to form and combine to create stars and other bodies.The second stage is how the earth formed.Between 4.5 and 3.8 billion years ago, clouds of dust floating in space settled into a solid globe.The earth became violent and it often exploded.The atmosphere and water appeared.Water is a fundamental matter for life to exist on the earth.It also dissolves harmful gases and acids.The third stage is about plants' and animals' appearance.At first, plants in the water appeared and multiplied.They produced oxygen, which encouraged animals in the water to exist.Later, green plants on the land caused animals on the land to appear.They first laid eggs and became babies.Later, mammals gave birth to babies directly.The last stage is that humans became the most important animals on the earth.We put too much carbon dioxide in the atmosphere to cause global warming.We must watch out how things will go and make laws to prevent the earth from becoming too hot.Now that we have taken measures, we will succeed in time.So let's cheer up and work together.

我们的地理老师说地球只是广阔的太阳系中的一颗行星而已。不像其他的行星，地球上有生命存在，但生命的起源依旧是一个谜。不同的宗教和文化有各自的看法。老师说它可以被分为四个阶段。

第一个阶段是关于宇宙是怎样诞生的。一个被普遍接受的理论可以解释它。“大爆炸”发生后，原子开始形成并结合成恒星和其他天体。第二个阶段是地球是怎样形成的。大约在38～45亿年前，漂浮在太空中的尘埃形成一个固体的球状物。地球活动剧烈，而且经常爆炸。大气层和水出现了。在地球上水是生命存在的最基本的物质。它同时也溶解有害气体和酸。第三个阶段是关于植物和动物的出现。首先，水生植物出现并繁殖。他们产生氧气，这使水生动物存在。后来，陆生植物使陆生动物出现。它们首先产卵，然后成为幼仔。后来，哺乳动物直接生幼仔。最后一个阶段是人类成为地球上最重要的动物。我们把大量的二氧化碳释

放到大气层里，导致了全球变暖。我们必须密切注意事情的进展，制定法律阻止地球变得太热。既然我们已采取措施，我们最终会成功的。因此让我们振作起来一起努力吧。

加餐练(一) 完形阅读组合练 Ⅰ.完形填空

Do you like talking or working together with your parents? It goes without saying that there are many __1__ in which young people can __2__ the older generation (代)．In both their work and their private lives, youngsters can get a lot from the __3__ of their elders.

As for work, the older generation can __4__ how young people can achieve the career they __5__.For example, they can __6__ what to do in order to develop the skills that will give young people the best chance of success.They may __7__ be able to give invaluable advice as to which __8__ young people should take or not take.It may even be the case that the older person will be able to ask their friends to help the younger one find a __9__.

Older people may also be able to use the __10__ of their own life experience to help young people with advice on __11__.It can happen that older people wish they had acted __12__ in their own relationships, so they may wish to encourage youngsters to avoid similar __13__.If young people are prepared to listen to this kind of __14__， it may well prove __15__ for them. Of the two __16__ of life discussed above, I think young people can learn more from the older generation in the field of __17__.After all, no relationship is the same, __18__ what might be __19__ in one situation might not in another.Advice on careers is more likely to be __20__ in a variety of differing situations.

语篇解读：本文是议论文。年轻人可以从上一辈人身上学到很多东西。 1．A.places B．ways C．styles D．habits

解析：选B 由下文年轻人可以在工作和人际关系上从上一辈人身上“学到(learn from)”很多东西可知，此处表示在很多“方面(ways)”。 2．A.hear of B．look after C．learn from D．talk about 解析：选C 参见上题解析。

3．A.joy B．experience C．kindness D．courage

解析：选B 第三段中的“their own life experience”对本空有提示。 4．A.decide B．predict C．change D．explain

解析：选D 本段主要介绍的是上一辈人对年轻人在工作上的帮助。因此此处表示：上一辈人可以给年轻人“说明(explain)”如何能够获得“梦想(dream of)”的工作。 5．A.dream of B．believe in C．give away D．give up 解析：选A 参见上题解析。

6．A.choose B．require C．plan D．suggest

解析：选D 上一辈人“建议(suggest)”年轻人应该做什么以获得必需的技能从而最大限度地获得成功。

7．A.also B．never C．instead D．only

解析：选A 本句是对上一句的递进，下一句是对本句的递进，故此处用also符合语境。 8．A.vacation B．exam C．job D．subject

解析：选C 本段主要讲的是上一辈人对年轻人在工作上的帮助，因此此处指接受“工作(job)”。

9．A.role B．hobby C．position D．way

解析：选C 上一辈人甚至可以请自己的朋友帮助年轻人找到“岗位(position)”。 10．A.difficulty B．introduction C．improvement D．advantage 解析：选D 上一辈人已经经历过生活中的很多事情，因此有生活经验这个“优势(advantage)”。 11．A.travels B．relationships C．education D．housework

解析：选B 下文中的“in their own relationships”对本空有提示。 12．A.unusually B．differently C．quickly D．patiently

解析：选B 根据上下文语境以及常识可知，上一辈人会反思自己的经历，对于有些事情，他们认为当时可以采取“不同的(differently)”做法(从而使事情更加完美)，而他们的经验教训可以避免年轻人犯类似的“错误(mistakes)”。 13．A.questions …… 此处隐藏：6481字，全部文档内容请下载后查看。喜欢就下载吧 ……