人教版高二英语选修八第二单元学案含答案

Unit 2 Cloning （Module 8）

Period 1 Reading: Cloning: Where is it leading us

Class ： Name ： __________ Group ： No ：______ Learning Objectives:

1. Learn the useful new words and expressions.

2. Read the passage and learn some information about cloning. Learning Key Points:

1. Grasp the important words and expressions in the reading material.

2. Learn the text and master the major uses of cloning and the success and problem of cloning Dolly the sheep. Learning Difficult Points:

1. Improve the reading ability.

2. Learn the reading skills: scanning and skimming.

Learning Procedures:

I. 【Pre-class homework 】 A. Warming up

There are two kinds of clones, a natural clone and a man-made clone. Do you know what is a natural clone? And what is a man-made clone?

A natural clone is one that ______________________________________________________ Man-made clone is one that ____________________________________________________

B. Pre-reading

Background reading:

Scottish scientists at Roslyn Institute created the much-celebrated sheep "Dolly", aroused worldwide interest and concern because of its scientific and ethical implications. She was the first mammal to be cloned from adult DNA taken from an adult cell. Previously, animals had only been cloned using embryo(胚胎) cells which already have the potential to become a complete embryo in its own right. The big breakthrough with Dolly was to make a clone from an ordinary, adult cell − in this case from a female goat’s udder.

Questions:

1. How does Dolly differ from other sheep?

She was ______________ by humans while the others were born naturally. So, Dolly was a ______________ sheep. 2. Should we clone a human?

II. 【While-class 】 Step1. Lead-in

Step2. Group discussion Step3．Consolidation 1. Reading

___________________________________________________________________________________________________

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A. 做《朗声》p23. Ⅳ

B. Read the text again and fill in the blanks.

Cloning is a way of making an 1._________ (exactly) copy of another animal or plant. It has two major uses .2. ________, gardeners use it to earn profits. Secondly, it is valuable for research on new plant species and 3.________ medical research on animals. Although cloning mammals is difficult 4.__________ (undertake), the determination and patience of the scientists 5._______ (pay) off in 1996. The fact 6._______ she seemed to develop normally was very 7._____________(encourage). But she had half of the 8.________ (long ) of the original sheep, 9._________ arose scientists’concern. Up to now, cloning is still 10. ___________ (controversy).

Step4．Presentation

Step5．Summary

III.【Post-class】