外研版高中英语选择性必修第四册Unit 5 Into the unknown Section Ⅳ Writing—Writing about the unexplained课件

(共18张PPT)
主题语境：人与自然——探究未知
本单元的写作任务是写一篇与自然之谜有关的文章。介绍自然之谜属于说明类文章，是高考英语写作中一种常见的考查形式。它要求从科学文献或权威机构搜集相关资料，并加以调查、整理，清楚地介绍自然之谜发生的时间、地点、经过等情况，使读者对此有一个完整、准确的了解。
第一部分：开门见山，引入话题。
1.The largest pyramid of all，also known as the Great Pyramid of Cheops (or Khufu)，was built around 4，600 years ago.
2.The topic of my speech is “The unexplained—the Loch Ness monster”.
3.In the north of Scotland there is a lake called Loch Ness，which is the deepest lake in the UK.
4.There are many unexplained mysteries of the natural world，of which the Sanxingdui Ruins is a particular one.
5.Many local citizens claim that they witnessed a big monster living in the water and weighing at least 1，000 kilos.
第二部分：列举猜想并给出解释。
1.Some believe that supernatural forces are responsible，while others put the accidents and disappearances down to coincidence.
2.What makes it more mysterious is that hundreds of perfectly round stones were found deep in a forest，but no one knows how nature made them.
3.Some people believe that a lake suddenly drying up was probably caused by supernatural things，such as angry spirits or magic from the earth.
4.The natural factors like gas bubbles rising from the ocean floor should also be taken into account because they can make water less dense and pull ships underwater.
5.Scientific theories，meanwhile，include pilot errors when pilots are trying to navigate the area，and huge “rogue waves” caused by terrible storms.
第三部分：得出结论。
1.Though scientists worldwide are still attempting to get to the bottom of this problem，no conclusive proof has been able to throw light on it so far.
2.Maybe in the future we can find the answer with the development of science and technology.
假定你是李华，埃及胡夫金字塔(the Pyramid of Khufu)是如何建造的是人类史上最大的谜题之一。有人说它是大量的奴隶建造的； 有人甚至认为它是外星人建造的。请用英语写一篇80词左右的短文向你校英语报的“The Unexplained”专栏投稿，要点包括：
1.胡夫金字塔的神奇之处(由230多万块巨石砌成； 平均每块重2.5吨)；
2.关于胡夫金字塔建造之谜的猜测；
3.相信这一谜题终将被解开。
[审题谋篇]
[遣词造句]
Ⅰ.对接单元词汇
1. 　　　　　　　 金字塔
2. 文明(社会)
3. (因奇特或神秘)激起……的兴趣，引起……的好奇心
4. 调查
5. 考古的；考古学的
6. 解释
7. 建造
8. 探索
9. 积极投入到……中去
10. 揭示
pyramid　　　　　　
civilisation
intrigue
investigation/check out
archaeological
explanation
construction
delve
throw oneself into
reveal
Ⅱ.巧用单元句式、语法完成句子
1.胡夫金字塔是埃及文明的象征，但是有关它的建造，却几乎找不到任何记录。
The Pyramid of Khufu is .However，when it comes to its construction，nearly no record has been found.
2.据估计，胡夫金字塔由230多万块石头组成，每块石头的平均重量为2.5吨。
the Pyramid of Khufu was made of more than 2.3 million stones，and the average weight of each stone is 2.5 tons.
3.它的建造过程一直是一个谜，多年来激发着人们积极去探索。
The process of its construction is a long-lasting mystery，which ______________________
__________________________ for so many years.
the symbol of Egyptian civilisation
It is estimated that
intrigues people to throw
themselves into its investigation
4.科学家们已经对其进行了详尽的调查，可是目前仍然缺乏有说服力的解释。
Scientists have but still lack persuasive explanations so far.
5.有人说它是由大量奴隶建造的；有人甚至说它是由来自外太空的外星人建造的。
Some say it ;some even say it was constructed by alien beings from outer space.
6.在我看来，随着考古技术的迅速发展，我们一定可以解开这个谜题，把真相公之于众。
As far as I am concerned，with the rapid development of archaeological technology，we are bound to solve the mystery and .
checked it out thoroughly
was built by a large number of slaves
reveal the truth to the public
[亮点提升]
使用动词-ing形式作结果状语合并句2和句3。
It is estimated that the Pyramid of Khufu was made of more than 2.3 million stones，and the average weight of each stone is 2.5 tons，making the process of its construction a long-lasting mystery，which intrigues people for so many years.
[连句成篇]
The Unexplained Mystery of the Pyramid of Khufu
The Pyramid of Khufu is the symbol of Egyptian civilisation.However，when it comes to its construction，nearly no record has been found.
It is estimated that the Pyramid of Khufu was made of more than 2.3 million stones，and the average weight of each stone is 2.5 tons，making the process of its construction a long-lasting mystery，which intrigues people to throw themselves into its investigation for so many years.
Scientists have checked it out thoroughly but still lack persuasive explanations so far.Some say it was built by a large number of slaves; some even say it was constructed by alien beings from outer space.
As far as I am concerned，with the rapid development of archaeological technology，we are bound to solve the mystery and reveal the truth to the public.
假定你是李华，你的新西兰笔友 Fred发来邮件，说他对大自然中的一些未解之谜很感兴趣，并希望你能把你了解的未解之谜介绍给他。请给他回信，介绍喜马拉雅山“雪人Yeti”。要点如下：
1.出现地点：喜马拉雅山；
2.相关信息：
(1)传说他们体型巨大，全身长毛，能像人一样行走。
(2)科学家曾发现“雪人”的毛发和脚印，猜想他们是古老北极熊的后代(descendant)。
3.研究结论：尚无科学证据证实其真实存在。
注意：写作词数应为80个左右。
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[参考范文]
Dear Fred，
At your request，I'm writing to introduce the Yeti，a mysterious wild creature found in the Himalayas，to you.Actually，people have never stopped the search for the wild creatures which are said to be large，hairy animals with the ability to walk like human beings.
So far，scientists have made several scientific searches for the Yetis but they only found some indirect evidence such as hair and footprints，which made them guess the Yetis might be the descendants of ancient polar bears.Though there have been various statements and arguments about the real existence of the Yeti，no scientific evidence has proved it.People still hope to throw some light on this mystery.
That's what I know about the Yeti，and I hope you will be interested in it.
Yours，
Li Hua