高三英语教案 Unit 4 Green World (教学详案)

Sf：He found 13 kinds of findes，related to each other in the structure of their beaks，tails，shape of body and colour of their feathers．The most curious fact was the differences in the size of the beaks．This could only be explained from the differences in habitat and source of food．The birds with broad beaks would eat hard seeds，while the birds with smaller beaks would eat soft seeds or insects．
T：Please give us the answers to the second question．
Se：He found that many characteristics were passed on from one generation to the next without influence by the environment．
Sh：I'll answer the last question of Part 1．He found evidence for the existence of stable varieties within species in nature．He showed that differences between plants of one species occurred as a result of the environmental conditions in their habitat．
Si：I think，in Part 2，for the first blank，we should fill in the words“of different，，and the second，“of the same’’．Am I right?
T: What do you think, Sj?
Sj：I think he is right．
T: For the last question, what are your opinions?
Sk：Soil conditions are important to the 0utput of crops．But that is one side of the question．The research by Darwin, Mendal and Turesson shows that both genetics and the environment are important to plants．If we don’t have good seeds，good soil conditions are not enough for us to improve the output of the crops．Am I right?
Ss：We agree with you．
(Teacher plays the tape after the students’discussion．Then teacher asks students to read the text aloud and find questions in the text．Teacher gives brief explanation to them．)
Step V Summary and Homework
T：Now let’s think about a question：What can we learn from the text?(Write it
on the blackboard．) Discuss it with your partner．(After a while．)Who can tell us what you think?
S1：We should observe everything carefully and think deeply，then we can draw fl
good conclusion．
T：Very good．Now let’S see how the scientists observe and think．
(Teacher writes Observation，Thinking．Conclusion…on the Bb．)
T：So much for the text．Now today’s homework：
1．Make sentences with the words and phrases：whatever：lead sb．to do sth．；nowhere，variety；in view
2．Do Writing on Page 35．
Sample writing：
Dandelions
In nature，there are varieties of environmental conditions for the plants to grow in．Some places are hot and dry and there is little rain while in other places it is cool and wet. So the same plants that in different places are quite different.
Let s take oanaeuons as an example. They are widespread and can be found almost everywhere．Their yellow flowers are beautiful and their leaves look like the teeth on a saw．The wind spread their flowers and seeds everywhere，so when they grow in hot and dry places，they are low and thin．Their flowers and leaves are short and light in colour．5—10 centimetres long．They grow close to the ground and their roots are deep in it．Their hearts are a little sunken into the earth，so that the rain water can flow from the leaves to the heart where the roots are．
But in places it is cool and wet，things fire different．They become higher and stronger and can grow as long as 15-20 centimetres．Theirleaves are broader and their flowers are larger．The colour of the flowers and leaves becomes darker green．If some weeds are taken here，there will be many of them a few weeks later．
A great Swedish scientist Cote Turesson said that differences between plants of one species occured as a result of the environmental conditions in their habitat．From dandelions we can see this clearly．
Step Ⅵ The Design of the Writing on the Blackboard
StepⅦ Record after Teaching
语言点讲解
procedure n.
1. 程序;手续;步骤，工序；[U][C]
The chairman was quite familiar with the procedure for conducting a meeting.
主席对开会的程序很熟悉。
The new work procedure is a great improvement on / over the old one.
新工序比起老工序来是一个巨大的改善。
The next procedure is as follows.
He complained to the manager, and by this procedure got the money back.
他向经理投诉，通过这种程序拿回钱
下一个步骤如下。
2. 常规;传统的做法[C][U]
The first step in the procedure for making a kite is to build the frame.
制作风筝的第一步是做骨架
bunch n.[C]
1. 串,束[(+of)]
Miss White received a bunch of flowers from her admirer.
怀特小姐收到爱慕者所送的一束花。
a bunch of grapes; 一串葡萄
2. 【口】群,伙,帮[G]
A bunch of children were at play.
一群孩子在玩。
merely adv.仅仅；只不过
I merely looked at the chocolate; I did not eat it.
我只不过看了看巧克力，我没有吃。
They are not merely content to fill the stomach.
他们不仅仅满足于填饱肚子。
You don\'t have to be angry. He merely wanted to know the truth.
\"你不必太生气了,他只不过是想知道点事实真相。\"
That was merely a guess of mine.
那只是我的一种猜测。
classifyvt.
1. 将...分类;将...分等级
People who work in libraries spend a lot of time classifying books.
在图书馆工作的人花大量的时间为书籍分类。
Eggs are classified according to size.
鸡蛋按大小分等级。
identification n.
1. 认出;识别;鉴定;确认[U]
the identification of criminals by their fingerprints

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