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1、Unit 3 The world of scienceWriting and presenting ideas【学习目标】1. Read an experiment report and understand the structure of an experiment report.2. Practise an experiment report with the help of the given structure.3. Improve your own ability of writing预习案【学习过程】Step 1: 自主学习回顾本单元话题探究案【合作探究】Home work ch
2、ecking (4 minutes)Benjamin Franklin was one of the Founding Fathers of the United States.Apart 1._ being a successful statements,he was also a 2._(create) scientist an inventor.Benjamin Franklin 3._(fly)a kite during a storm in 1752.he raised the kite with a piece of sting 4._(tire) to it.A metal ke
3、y was attached ti the sting.A flash of lighting hit the kite,and electricity was conducted through the sting to the key.Franklin then touched the key and got 5._ electric shock.Generations of schoolchildren have been amazed by his 6._(brave)and scientific approach to 7._(look)for the truth.However,n
4、ew research suggests that the story may be fiction instead of a fact.More than one scientist has questioned 8._ really happened.They all agreed that if Franklin had 9._(actual) touched the key,he would certainly have died from electric shock.In science,facts should 10._(prove) by experiments and res
5、earch,and we should not always believe everything we read or hear- even if it is a great story.Step 1Activity 5 Read the instructions for the experiment and answer the questions.(4 minutes)1. What will the results of this experiment be?2. What can you learn from this experiment?Step 2 Writing help(5
6、 minutes)1.How to write an experiment report:.Introduction:Introduce the aim of the experiment.Main body:Describe the materials used in the experiment and explain the procedure.Conclusion:Report the results and what you have learnt.2.Fill in the tableIntroductionThe aim of the experimentThis experim
7、ent is designed to a)_Main bodyThe materials used and the procedureI prepare b)_to do this experimentProcedure c)_conclusionThe result and what we have learnedAfter the experiment,I can draw the conclusion that d)_Step 3 Discussion(10 minutes)1.Answer the following question.1).Why does the egg get p
8、ushed inside the bottle?2).Write a report of the experiment and share it with the class.Step 4 Fill in the blanks (5 minutes)The experiment is designed to prove 1._ air pressure really exists. At the beginning of the experiment, I prepared the materials, 2._(include) a boiled egg, a glass bottle 3._
9、 neck is a bit smaller than the egg, and some hot water. With all the things 4._(prepare), the experiment began. First, I removed the shell of the egg. Then, I 5._(careful) poured some hot water into the bottle, and 6._(shake) the bottle gently. After a few minutes, I poured out the hot water. Just
10、at the same time, I quickly placed 7._ egg on top of the bottle. To my 8._(amaze), the egg squeezed into the bottle at once. 9._ the experiment, I can draw the conclusion 10._ air pressure indeed exists, and it is very powerful. It is the force of the air that pushed the egg into the bottle.Step 5 w
11、riting (14 minutes)假如今天在物理老师的帮助下,你们做了一个有趣的实验。请根据以下实验步骤,用英语写一篇80词左右的短文。1.准备一支蜡烛、一个盆和一些水,一个比蜡烛稍高些的玻璃杯。2.将蜡烛置于盆底,并向盆中倒入一些水。3.点燃蜡烛,将玻璃杯罩在蜡烛上。4.当蜡烛熄灭后,看到玻璃杯中水面高于盆中水面。参考词汇:盆 basin一、审题1.确定体裁:本单元的写作是实验报告,属于说明文。按照实验报告的格式,写作内容包括五个方面:Aim实验目的; Apparatus实验器材;Method实验步骤;Result实验结果;Conclusion实验结论。2.确定人称:本文的主要人称为第一
12、人称。3.确定时态:时态以一般现在时为主,对实验过程的描述可用一般过去时。二、谋篇就本篇习作而言,我们可以把全文分为三部分。第一部分:说明实验的来源(课上物理老师做的实验);第二部分:说明实验的器材、实验步骤;第三部分:说明实验结果并进行评价。三、框架Today,we carried out_Before we started,we prepared_To our astonishment,_四、成形An Experiment Report_Step 6.A discussion (presenting ideas)(3 minutes)Choose one object and write
13、a short passage to describe how it has changed and predict how it will further change over the next 50 years. Step 7 Home workChoose one of the objects in last activity or an object that you use every day. Predict how it will further change over the next 50 years. Make notes about your idea.Present
14、your ideas to the class. Use the notes in last activity and the expressions (on page 36)in the box to help youMy object is_.How will it change_.Why it will change_.【参考答案】1.Home work checkingThe key:1.from 2.creative 3.flew 4.tired 5.an 6.bravery 7.looking 8.what 9.actually 10.be proved2.Step 1Activi
15、ty 5 The key:1. After the egg is sucked into the mouth of the bottle, it is slowly absorbed into the bottle and falls to the bottom.2.Through my own experience, I have learned that as long as we study hard, observe and think carefully, we can figure out the secret of some scientific facts.3.Step 2 W
16、riting helpThe key:a)figure out why the boiled egg is swallowed by the hot glass.b)such materials as a boiled egg, a glass bottle (bottle-neck a bit smaller than the egg) and hot water c)1. Remove the shell of the egg.2. Carefully pour some hot water into the bottle.3. Shake the bottle gently.4. Pou
17、r the hot water.5. Quickly put the egg on top of the bottle.d)After the experiment, I can draw the conclusion that it is true that a boiled egg can be swallowed by a hot glass bottle in the right experiment. Through this my own experience, I have learned that so long as we just study hard, observe a
18、nd think carefully, we can figure out the secret of some scientific knowledge.4.Step 3 Discussion1).The key:The answer is all about air pressure. If you first set the egg on an empty bottle, the air pressure inside the bottle matches the air pressure outside, so nothing happens. But when you pour so
19、me hot water into the bottle, it causes the air inside to heat up and expand rapidly, so some of the air in the bottle gets out. When the egg is put on the bottle, the air pressure outside of the bottle pushes the egg into the bottle. The result is an unbalanced force the force of the air pushing on
20、 the egg from outside the bottle is greater than the force of the air pushing up on it from inside the bottle. As a result, the egg is pushed into thebottle.2).This experiment is designed to prove whether air pressure really exists.I prepared the materials, including a boiled egg, a glass bottle who
21、se neck is a bit smaller than the egg, and some hot water to do this experiment.First, I removed the shell of the egg. Then, I carefully poured some hot water into the bottle, and shook the bottle gently. After a few minutes, I poured out the hot water. Just at the same time, I quickly placed the eg
22、g on top of the bottle. After the experiment, I can draw the conclusion that air pressure indeed exists, and it is very powerful. It is the force of the air that pushed the egg into the bottle.5.Step 4 Fill in the blanksThe key:1.whether 2.including 3.whose 4.prepared 5.carefully 6.shook 7.the 8.ama
23、zement 9.After 10.that6.Step 5 writingAn Experiment ReportToday,with the help of our physics teacher,we carried out an interesting experiment in class.Before we started,we prepared a candle,a basin,a glass and some water.By the way,the glass was a little higher than the candle.First,the candle was k
24、ept standing at the bottom of the basin and some water was poured into the basin.Then we lit the candle,covering it with the glass that was full of air.What we had to do was wait until the candle went out.To our astonishment,we saw that the water level in the glass was higher than that in the basin.What an interesting experiment lesson we had!7.Step 6 A discussion (presenting ideas)The key(略）