七年级下册（2012秋审查）Unit 5 Water课堂教学ppt课件

这是一份七年级下册（2012秋审查）Unit 5 Water课堂教学ppt课件，共8页。PPT课件主要包含了dry up，Four等内容，欢迎下载使用。
What are they ding?
They are ding experiments.
This by is ding an experiment, t. Lk at the pictures and put them in rder.
Describe the pictures.
Fr example:He is adding sme salt t a glass f water carefully.
stir(搅拌) the water
heat the water
Lk at the flw chart and answer the questins.
1. Hw many steps are there in the flw chart?2. Where des the flw chart start and where des it end?
It starts at the tp and ends at the bttm.
Write a shrt paragraph abut this experiment. Use the infrmatin in A t help yu.
Then stir the water. The salt disappears and becmes part f the water. Next, heat the water. Yu can see a white clud. It is made up f small drps f water.
cntinue t heat the water
Tip:做实验要分步骤来完成，并且有一个先后顺序，描述实验时可以适当地使用 first, next, then 和finally等使文章条理清晰。First...（首先）, next...（接下来）, then...（然后）, finally...（最后）。
介绍做事情的方式、方法、程序的文章，如美味佳肴的制作、产品的使用说明或实验过程的描述等，属于说明文写作。这类文章我们一般分成四个部分来完成。一、用一两句话说明你预备给读者介绍什么 (一道美食的做法，还是一个实验的过程)，即交代主题。二、告诉读者你所需要的材料或工具。三、一步一步解释说明制作或完成的过程。这是文章的主体部分。四、给出简单结论。
Hw t describe a prcess?