1、The Fourth Period Extensive ReadingTeaching goals 教学目标1. Target language目标语言a: 重点词汇和短语 characteristic, inherit, complicated, nonetheless, complicated, transfer, transgenic, violence, peculiar, in detail, to a (great) extent, in favour ofb: 重点句式1. To a great extent, its your genes that decide2. With
2、these new developments, life is going to become even more complicated. 3. In Europe, a majority of consumers are in favour of banning them, and 79 percent of the UK public opposes GM food.4. The absence from his bearing of any kind of fear struck me at once.5. Gradually the truth dawned on me.2.Abil
3、ity goals 能力目标 Enable the students to know about more knowledge about genes and GM food.3.Learning ability goals 学能目标Help the students get to know about more knowledge about genes.Teaching important and difficult points 教学重难点Enable the students to talk about the advantages and disadvantages of GM fo
4、od.Teaching methods 教学方法Fast reading, careful reading and discussion. Teaching aids 教具准备A computer and a projectorTeaching procedures and ways 教学过程与方式Step I Greeting and RevisionT: Good morning / afternoon, class!Ss: Good morning / afternoon, Mr. / Ms T: What kind of information did you get from the
5、 Internet?S: Researchers from around the world have launched a three-year project aimed at identifying genes that are responsible for such common illnesses as cancer, heart disease and diabetes. The effort is an outgrowth of the Human Genome Project.S: Like the fingerprints, each person has a unique
6、 DNA profile, or what is sometimes called a DNA fingerprint.S: Studies have shown GM maize and corn may already have led to serious environmental and health consequences and could have contaminated more natural seedlings. S: Enterprises failing to label genetically modified products they produce or
7、sell will face punishment,T: You did a good job. You have known more about the genes and GM food which can help you learn these texts.Step II Reading (1)T: Now turn to page 22, we will read the article “Your Genes, Your future”. Before reading, who can give us a further explanation of the title for
8、us? Volunteer?S: As is known to us, every cell in our bodies contains our genes, which pass hereditary characteristics on to their children. Different people have different genes. Some peoples genes are excellent. Some are not so good. So there are some clever people. Some are normal. Some are stupi
9、d. Therefore, in a sense ones genes can predict his future.T: You got it! Now please read this passage quickly and complete the 2 sentences on page 22.Get the students to finish it and then check the answers.T: Read the passage again. First look through the 5 questions of Exercise 2 on page 23. Whil
10、e reading, pay more attention to the related information. You can discuss in groups.Suggested answers:1. Physical is inherited and characteristics are mostly inherited.2. No, it doesnt. For example, not all the prisoners children break the laws.3. A person who lives in the world, is not only influen
11、ced by his genes but also by the environment he lives in, however, the scientist can only red his genes. 4. These new development refers to the fact that scientists will be able to “read” our genes in the near future.5. For example, insurance companies may not want to insure people whose genes predi
12、ct certain illnesses. Employers may not want to employ people who have a gene for violence.T: Now lets look at Exercise 3 on page 23. Match the words and expressions in the box with their meanings. (If there is enough time, the teacher can ask the students to make sentences using the words and expre
13、ssions in the box.)T: Now lets look at Exercise 4 on page 23. Explain the meaning of the words and phrases. First look at the examples, it not only gives the meaning of the word but also gives the meaning of word in the whole sentences. So you should also explain the meaning of the words and phrases
14、 in this way.Suggested answers:1. If someone has a good habit, he can grow well naturally. In this case, heredity plays an important role. So the scientists can predict the persons height by looking at his parents height.2. The need to wear glasses means the people cant see the things clearly withou
15、t glasses. The genetics is one of the reasons of the poor sight.3. Eating habits means what kind of food a person likes or dislikes. Our genes affect the eating habits greatly. 4. If you like racing car, which is risky sport that means you enjoy dangerous sports.5. How well we get on with other peop
16、le mean what kind of people we are, communicative or not.6. Read the genes means decode the genes. That is to say we can know the genes clearly.T: We have learnt DNA The Secret of Life on page 16. Now lets read it again. Compare it with Your Genes, Your Future on page 23.(The teacher should allow th
17、e students to give various answers as long as reasonable. In this way, the teacher can train the students active thought.)Suggested answers:1. I find Your Genes, Your Future is more exciting. At the beginning, there is a mysterious envelope for me. 2. Both of the passages worry me. They both mention
18、ed some problems would come into being with the development of the genetics.3. DNA The Secret of Life gives the examples from real life. I prefer examples from real life in other passage.4. Your Genes, Your Future gives more scientific information. I prefer to have more scientific information.5. I w
19、ill remember the passage Your Genes, Your Future for long. From this passage, I know that although inborn factors are important, the acquired factor is also very important.Step III Reading (2)T: GM food is very popular today. But is it good or bad for us? Now we will read a passage about this topic.
20、 Before reading, work in pairs and discuss your answers to the 6 questions on page 25 that help you understand the passage better.Suggested answers:1. GM food means the food is produced from the plants which are genetically modified.2. We can tell the difference between ordinary food from GM food fr
21、om the label of the food.3. There is not very much GM food in China.4. Fr instance, GM rice offers high yields and improved nutritional content to better feed the rice-eating population. 5. Studies have shown GM maize and corn may already have led to serious environmental and health consequences and
22、 could have contaminated more natural seedlings. 6. GM food should be labeled, so as to give consumers the right to know and to choose.T: Now read the passage and find the answers to the question: GM food good or bad?(The teacher should ask the students to give their reasons.)T: Read the passage aga
23、in, answers the questions of Exercise 3 on page 26. Suggested answers:1. Yes, they are the same food.2. It can leave a poison in soil that kills helpful as well as harmful insects.3. Reducing the amount of insecticides needed by using GM crops can reduce the amount of cancer producing chemicals carc
24、inogens that are found in food.4. Maybe it will even kill him or her.5. The author gives some figures, including percentage, to show the mount of GM food in US and to show the number of people who think its dangerous. The contrast shows that most of the people accept the GM food and US produced a la
25、rge amount of it.6. “Agricultural Organism Transgenic Engineering Safety Implementation Measures” issued by the Chinese Ministry of Agriculture do not apply to imported agricultural products. 7. During a survey of big marketplaces in Beijing no imported transgenic products were found.8. China Consum
26、ers Association states that GM products should be labeled, so as to give consumers the right to know and to choose.9. Yes, I think the writer agrees with this action.T: Look at the questions of Exercise 4 on page 26. Please have a discussion and give the answers to these questions.Suggested answers:
27、1. a. The crop with a gene that kills pests can leave a poison in the soil that kills helpful as well as harmful insects. b. The crop contains anti-carcinogens. c. The poison in the soil that kills helpful as well as harmful insects.2. a. We can plant a crop with a gene that kills pests to reduce th
28、e amount of insecticides needed. b. The crops, which are attacked by insects, need insecticides. c. We can plant a crop with a gene that kills pests.3. a. It is a gene that produces an allergic reaction. b. The person is sensitive to some kinds of food. c. The person might not know there are some al
29、lergic materials in the modified food.4. a. “Agricultural Organism Transgenic Engineering Safety Implementation Measures” are issued by the Chinese Ministry of Agriculture. b. They do not apply to imported agricultural products. c. GM food may enter the country from abroad to conquer our market.T: N
30、ow work in pairs and discuss your answers to the questions. The first one: Are you for or against GM food? Explain why. S1: I am for GM food. Because GM food offers high yields and improved nutritional content to better feed the population. Moreover, there is no evidence showing GM foods are harmful
31、 to health.S2: I dont agree with you. I am against GM food. No harmful evidence does not mean the products are safe. The side effect of a new product is usually found only after a long period. So we should be so careful when choosing the GM food.T: Terrific! The second one, what do you think should
32、be done about GM food in China? Ban the planting of GM crops, ban the sales of GM food, or anything else?S1: I think we should ban the planting of GM crops, because by far we have not had clear evidences about whether GM crops are good or bad. So we should be cautious.S2: I think we should ban the s
33、ales of GM crops. The scientists do more experiments about it chronically to prove what kind of food it is on earth.S3: I think we should label the GM food clearly. First, the customers have the rights to make their own choices. Second, in the future if the GM food had some side effect, we can clearly judge the source of the food.T: Thank you! You all give us the excusable answers.Step V HomeworkRead Two Creatures in The Time Machine and give answers to the first question on page 27.
