Unit3 Lesson1 The Sixth Extinction 学案-（2019）选择性必修第一册

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选修一Unit3Lesson1 The Sixth Extinction学案
【学习主题】
文体属于说明文。属于“人与自然”主题中的“物种的灭绝与保护”话题。本文讲述了物种灭绝的概念、历史上两次重大的物种灭绝及恶果、导致物种灭绝的种种原因(主要是人类活动)、如何避免第六次物种大灭绝。
其主题意义在于通过对物种的灭绝与保护话题的讨论，让读者在思想上意识到物种保护的重要性，尤其是对人类的巨大意义。同时，作者呼吁政府和个人各尽其责，采取行动，通过改变生活方式、改进耕作方式、减少污染等切实措施呵护物种，保护美好星球。
【课标要求】
能从一般性文章中获取主要信息，能理解物种保护类语篇的基本要义，能分析说明文的文体特征和写作目的。通过物种的灭绝与保护的主题学习，提高物种保护意识，意识到人类生存与环境的关系。在日常生活、学习和工作中，通过点点滴滴的实际行动来保护地球。
【学习目标】
1.获取、梳理文本关于物种灭绝方面的基本知识与基本信息，如物种灭绝的概念、严重后果、导致原因以及如何避免第六次物种大灭绝;
2.分析、阐释该篇说明文的语篇特点及语言风格;
3.归纳作者对人类活动与物种保护的关系的观点，补充你关于增强物种保护的看法。
【评价任务】
1.围绕“物种的灭绝与保护”为主题，完成每段落思维导图，提取文本的基本框架与关键信息。
2.按照表格顺序，完成信息表，分析该篇说明文的写作手法，如下定义、摆事实、引观点、举例子、列数据、作假设、分析因果关系等。
3.对文本两类定语从句进行分类列表，探讨定语从句的功能及特点。
4.续写文章最后一段，在作者所提出的解决措施基础上，续写你自己的解决措施。
【学习过程】
Step1 Context Creating
The teacher presents a video clip to show the extinction of some wild animals and ask the students:
What's your opinion ?
Ss: ......
Transition: Well, today let's learn something about extinction and see how to avoid the sixth mass extinction.
Step2  While-Reading
1.First Reading
※Read the first paragraph of the text and complete the following question.
What is the writing style?
A.An exposition.(说明文)
B.An argumentation.(议论文)
C.An narrative.(记叙文)
D.A practical essay.(应用文)
2.Second Reading
Pair work
1)Complete the half-open mind map in Exercise 3 at Page 54 to extract the basic structure and key information of the article.
2)Read the words and expressions in the following Word Bank on Extinction.
species n.物种
dinosaur n.恐龙
survive v.存活
oxygen content 氧气含量
volcanic eruption 火山喷发
global warming 全球变暖
is cause for concern 让人担忧
natural causes 自然原因
die out 灭绝;消失
wipe out 消灭;灭绝
mass extinction 大灭绝;大毁灭
endangered species 濒危物种
solar energy 太阳能
off the coast 海岸附近的
lay eggs 下蛋
restore habitats 修复栖息地
take action to do sth. 采取行动做某事
take steps to do sth. 采取措施做某事
take measures to do sth. 采取措施做某事
2.Third Reading
Pair work
1)What ways of argument does the writer use to convince readers?
Scan the news report and discuss some typical features of an exposition.
◎giving definitions(下定义)
◎presenting facts(摆事实)
◎citing ideas(引观点)
◎giving examples(举例子)
◎using data(列数据)
◎making assumptions(做假设)
◎analyzing cause and effect(分析因果关系)
2)What typical grammar is used in the article? Explore the sentences with the grammar. Why does the author use it so frequently？
Example:
◎Extinctions, where entire species are wiped out, are not unusual in our Earth's history.
◎
◎
◎
◎
◎
.........
3.Third Reading
Solo work
Continue to write the last paragraph, making more suggestions on avoiding the sixth extinction by using as many relative clauses as possible.
Step3  Post-reading
Pair work
Read through the Case Study called The Black Robin and draw a conclusion from the case.
阅读教材53面上的题目为《黑色知更鸟》的生态保护类案例研究小短文，并从中总结出物种保护的观点或有效做法。
Step4  Homework
Finish the related exercises in your School- Based Workbooks.
【教学反思】
◎Have the students grasped the features of an exposition?
◎Are the students aware of the urgency to conserve species now?