高三英语教案 Unit 4 Green World

4.John把他的电子邮件地址告诉了他的中国笔友，以帮助他提高他的英语
水平。
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The fifth teaching period
Teaching content: Integrating Skills
Teaching Aims:
Get the students to grasp the main idea of the text so as to improve their reading ability.
Teaching Important Points:
How to analyze an article so as to grasp its main idea.
Teaching Difficult Points:
How to improve the students’ reading ability and how to analyze an article.
Teaching Procedures:
Step 1 Revision
Have a dictation.
Step 2 Fast-reading
Give the students a few minutes to read the text and answer the following questions.
1.What was Charles Darwin’s hobby when he was young?
When he was young, Darwin enjoyed doing all kinds of experiments and studying physics, chemistry and later botany was his hobby.
2.What led Darwin to write his famous book “On the Origin of Species”?
When he was 22,he was invited to take part in the scientific expedition on the Beagle. His observations on the five-year voyage led him to write his famous book On the Origin of Species.
3.Who founded the science of genetics?
It was the research work of Mendel that gave birth to the science of genetics.
4.Who made a contribution to the improvement of the output of crops according to the text?
Mendel’s genetics and Turesson’s findings are both important to the output of crops.
Step 3 Reading and comprehension
Tell the students to read the text carefully again and answer the following questions. Let them to discuss their answers. Then check their answers with the whole class.
1.What did Darwin discover about bird species in Galagagos?
The differences in habitat and source of food led to different species.
2.What did Mendel observe in his experiments with peas?
He found that many characteristics were passed on from one generation to the next, without influence by the environment.
3.Looking at wild plant species in Sweden , what did Turesson discover?
He showed that differences between plants of one species occurred as a result of the environmental conditions in the habitat.
4.What were Darwin’s discoveries based on?
Step 4 Language points:
1.experiment
1)n make /carry out /perform an experiment 做实验
2)v experiment on animals 用动物做实验
experiment with new methods 实验新方法
2.relate
1)relate…to…使……与……有联系
I can’t relate what he says to what he does.
2)be related to
The book is related to pollution. 这本书上有关污染的。
He said he was related to queen. 他与女王有亲戚关系。
3)related to 作后置定语
The case related to Tom is being investigated by the police.
4)relation n.
3.design sth for sth / to do sth 打算做……用， 意图……
The film is designed /intended/meant for adults. 这部电影是给成年人看的。
4.view 观察，视力，视域
come in view 出现在视野 bring sth back in view 重现在视野
in one's view 在某人看来
The speaker stood in full view of the crowd. 那演讲者站在听众可以完全看得见的地方。
The police brought back the spot where he was murdered in view. 警方重现了他遇害的现场。
Step 5 Analyzing
Help the students to analyze the following sentences.
1.It was Darwin’s visit in the Beagle to the Galapagos Isles that gave him the key ot his new theory.
2.Back home ,in England ,Darwin realized that differences in habitat could lead to different species in birds as well as in plants.
回到英国，达尔文意识到栖息地的差别会导致鸟类的差别，植物也一样。
3.Although his experiments were designed to support the ideas concerning tie influence of environment upon plants., he found that many characteristics were passed on from one generation to the next, without influence by the environment.
尽管他的研究原本是要证明环境对植物的影响，但他发现许多植物的特点在一代代的流传中并未受到环境的影响而保存了下来。
4.When growing on rocks, the plant grows to a bush , having broad leaves and large flowers.
5.However, Turesson’s findings show that habitat, such as soil conditions, is of equal importance to the output of crops.
然而，杜尔松的发现说明生长地，比如土壤的条件，对作物的产量也同等重要。
Homework:
Read the text after the text.

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