人教课标版高中英语选修8unit2reading (2).pptVIP

2. Which of the following is not an advantage of cloning? Cloning can be used for medical purposes. Large quantities of food can be produced by cloning. Cloning can help keep animals from becoming extinct. Famous persons who have passed away can be cloned. 3. What’s the writer’s attitude towards cloning? A. Supportive B. Neutral C. Negative D. Subjective 中立的 objective 客观的，公正的 Detailed-reading Task1: Group work1 (3minutes) Discuss in groups and then show us the procedure of the cloning of Dolly the sheep. The procedure of cloning Dolly the sheep: First, female sheep A provides _________, whose nucleus is removed. Female sheep B provides a _______ cell, whose nucleus contains all the genes needed to produce a new sheep. Then the nucleus from sheep B and the egg cell from sheep A are joined using ____________. The cell divides and grows into an _______, which is put into female sheep C. So she becomes the carrier of the clone. Finally, a new lamb, which is the clone of sheep B, is produced. an egg cell somatic electricity embryo Detailed-readingTask 2: Fill in the chart using the information from the reading passage. (4minutes) Problems or dangers of cloning Advantages of cloning 1. Animal clones may develop the _______ of older animals. 1. Medical cloning could be used to _____ serious illnesses in humans. 2. Animal clones may die _______ than the donor animals. 2. Gardeners can use cloning to produce ____________ qualities plants. 3. _____ leaders may want to clone themselves. 3. Cloning is valuable for research on ___________________. 4.There are ________ questions of cloning human beings. 4. Cloning is valuable for ___________________ on animals. Answers: Problems or dangers of cloning Advantages of cloning 1. Animal clones may develop the _______ of older animals. 2. Animal clones may die _______ than the donor animals. 1. Medical cloning could be used to _____ serious illnesses in humans. 2. Gardeners can use cloning to produce ________