外研版高中英语必修第三册Unit 3 The world of science Section Ⅳ Writing—Writing a recipe课件

(共18张PPT)
主题语境：科学发展与科学精神
本单元的作文是写一篇实验报告。完成一个实验的步骤包括设计实验、做实验和写实验报告。实验报告通常包括以下内容：实验目的、实验用品、实验方法和过程、实验现象以及通过实验得出的结论。
写实验报告时，注意要完整介绍实验过程，用恰当的表示顺序的词语来清楚表述实验步骤。
一、做实验的相关表达
1.carry out/do/conduct an experiment 做/进行实验
2.observe carefully 仔细观察
3.wash hands with soap 用肥皂洗手
4.turn off the power 关闭电源
5.shut the door and windows 关闭门窗
6.Follow your teacher's instructions. 听从老师的指示。
7.Listen to your teacher carefully. 认真听老师讲。
8.Do what the teacher tells you. 按老师告诉你的去做。
9.Don't touch anything in the cabinet. 不要碰储藏柜里的任何东西。
10.Don't come here without the company of a teacher. 没老师陪同不要来这里。
二、有关实验报告的写作
1.We carried out/did/conducted an experiment in the lab today.The following things were used.
2.Today we did an interesting experiment in chemistry class.The experiment was designed to...What we used in the experiment was a glass and a candle.
3.To carry out the experiment，we need the following things：a glass，water，an egg and about 250 ml of vinegar.
4.When doing the experiment，we first...Then/Next...After that，we...and waited to see what would happen.
5.The experiment is divided into 3 steps：First，we...Second，...Finally，...
6.To our astonishment/surprise，we saw that...
7.The result of the experiment was that...What an interesting experiment class we had!
请根据下面表格的内容写一篇80词左右的实验报告。
实验目的 测量镁在空气中加热后重量是否有变化
实验用品 镁(magnesium)、本生灯(Bunsen burner)、秤(balance)、坩埚(crucible)
实验步骤 1.把镁放进坩埚内；
2.把坩埚放在秤上称重；
3.点燃本生灯，加热坩埚；
4.再把坩埚放在秤上称重；
5.比较两次称重的结果
实验结果 第二次称重数据大于第一次称重数据
实验结论 镁在空气中加热后重量有变化
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[审题谋篇]
[遣词造句]
Ⅰ.对接单元词汇
1._______ 弄清
2.___________ ……方面的变化
3.___________________ 进行实验
find out
a change in...
conduct the experiment
Ⅱ.巧用单元句式、语法完成句子
1.这个实验的目的是弄清楚镁在空气中加热后重量是否会发生变化。
The aim of the experiment is ________________________________after magnesium is heated in air.
2.你需要以下这些东西来进行实验。这些东西是镁、本生灯、秤和坩埚。
You need the following things______________________.Things are magnesium，a Bunsen burner，a balance and a crucible.
3.所有这些准备好，然后你就可以开始实验了。
_________________，and you can begin the experiment.
4.把镁放入坩埚中。然后将坩埚放在天平上并称重。
Put the magnesium in the crucible.Then_______________________________________.
to find out if there's a change in weight
to conduct the experiment
All these are ready
put the crucible on the balance and weigh them
5.点燃本生灯，把坩埚放在灯上加热镁。
Light the Bunsen burner and ___________________________the magnesium.
6.再次称重，并比较两次的重量。
Finally，weigh them again，and_____________________.
7.你会发现镁比之前稍微重了一些。
You can see that the magnesium weighs_____________________.
8.这是因为镁在空气中加热后重量发生了变化。
___________________________________after magnesium is heated in air.
place the crucible over it to heat
compare the two weights
a little more than before
That's because there is a change in weight
[亮点提升]
1.用主语从句改写句2。
_____________________________________________________________________________________________________
2.用with复合结构改写句3。
___________________________________________
What you need to conduct the experiment is the following things：magnesium，a Bunsen burner，a balance and a crucible.
With all these ready，you can begin the experiment.
[妙笔成篇]
__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
One possible version：
The aim of the experiment is to find out if there's a change in weight after magnesium is heated in air.
What you need to conduct the experiment is the following things：magnesium，a Bunsen burner，a balance and a crucible.With all these ready，you can begin the experiment.First，put the magnesium in the crucible.Then put the crucible on the balance and weigh them.Next，light the Bunsen burner and place the crucible over it to heat the magnesium.Finally，weigh them again，and compare the two weights.
You can see that the magnesium weighs a little more than before.That's because there is a change in weight after magnesium is heated in air.
假设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，用英语写一篇实验报告。
1.准备一支蜡烛、一个比蜡烛稍高些的玻璃杯、一个盆和一些水；
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。
注意：写作词数应为80个左右。
参考词语：盆basin
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One possible version：
Today，with the help of our physics teacher，we carried out an interesting experiment in class.
Before we started，we prepared a candle，a glass that must be a little higher than the candle，a basin and some water.First，we let the candle stand at the bottom of the basin and poured some water into the basin.Then we lit the candle and covered it with the glass that was full of air.We waited until the candle went out.
To our astonishment，we saw that the water level in the glass was higher than that in the basin.How interesting an experiment lesson we had!