Unit 3 Animals Are Our Friends Lesson 17 Save the Tigers导学案

Lesson 17:Save the Tigers导学案
学习目标：
1、掌握下列单词century, fur, symbol, courage, brave, chain, balance, reason, disappear, kill, cut, decrease,
短语at the beginning of, drop to, food chain, in balance, in danger, cut down, as well.
了解保护动物的方法。
学习重难点：
重点：Master the new words and phrases, and make the Ss can talk about the animals in English.
难点：Talking about the animals, and how to protect the animals.
导学方法: 独立自学与互助学习相结合，理解课文大意, 速度竞赛，让同学们更积极，有自信
导学过程:
前置学习
复习巩固
(一).检查lesson16的单词，短语
(二).按要求改写下列句子，每空一词。
She wants something delicious for dinner. (对划线部分提问)
________ ________ ________ ________ for dinner
Why did they go to the zoo？.(改为同义句)
________ did they go to the zoo ________？
3.Let’s tell Danny about it, _______ _______ (改为反意疑问句)
4.Danny ,did you hear the news ( 改为否定回答) No， ________ ________ .
5.There is a bear in the cage，________ ________？(改为反意疑问句)
二.呈现目标，明确任务
交流释疑
自学
(一).小组学习课文，完成下列词组和句子
1. 在......之初_________ 2.下降到_________ 3.保持平衡 _________
4食物链_________ 5.代表_________
6. 他们班的学生数是40。 _________ _________ _________the students in their class is 40.
7. 动物对环境很重要。 Animals are very _________ _________ the environment.
8. 老虎住在什么地方？ _________ _________ tigers live？
9. 很多动物正在消失。你知道为什么吗？ Many animals _________ _________. Do you know why
10.保护动物是我们的责任。 ________ ________ ________ our duty.
(二).列出动物名称，看谁列的最多，速度最快
二. 互助
(一). 生生互助: 共同学习重点句子，并总结知识点，画出不理解处，小组之间交流
(二). 教师点拨
1. At the beginning of the 20th century, the number of tigers in the wild was around 100 000. 在二十世纪初期，野生老虎的数量大约是十万。
the number of是固定短语，意为“……的数量”，后接可数名词复数，但中心词是number，所以谓语动词要用单数。
e.g. The number of students in our school has grown from 1,000 to more than 1,500.
a number of为量词短语，意为“许多；大量”，相当于a lot of或lots of，中心词是该短语所修饰的可数名词复数，所以作主语时，谓语动词用复数形式。number前可用large，small等修饰，表示程度。
e.g. A number of students like playing computer games.
2. But today that number has dropped to a few thousand. 但是现在，数量已经下降到几千只。
a few thousand表示“几千”。当hundred, thousand前面是基数词one, two, three…a few, many时，其后不加s。当hundred和thousand后面加s时，需要跟of修饰可数名词复数。
e.g. There are three thousand students in our school.
Thousands of students are on the square.
3. It helps keep the number of other wild animals in balance. 它可帮助保持其他野生动物的数量平衡
balance 在句中用作名词，意为“平衡；均衡”，常用短语be out of balance，意为“不平衡”；keep in balance意为“保持平衡”；balance还作动词，表示“（使）平衡；（使）均衡”。
e.g. You must learn to keep your balance in skating. 在滑冰时你必须要学会保持平衡。
4．In recent years, tigers have been in danger of disappearing. 近年来，老虎已经面临消失的危险。
danger意为“危险”，通常是不可数名词，表示做某事的危险或发生某情况的危险等，常用短语 be in danger (of)，意为“在危险中”。
e.g. Is there any danger of fire 有发生火灾的的危险吗？
You’re in danger of catching a cold.
The passengers are in danger! Let’s go and help!
5. As forests disappear, tigers lose their homes.随着森林的消失，老虎失去了它们的家园。
as在句中作连词，引导状语从句，意为“随着，当……的时候”。
e.g. As the sun rose, the fog disappeared.
As she left the room, she remembered that book.
训练提升
一.展示
(一)英汉互译。
1. a group of volunteers_______________ 2. 在二十世纪初_______________
3. 力量和勇气的象征_______________ 4. food chain_______________
5. in danger_______________
(二)根据句意及所给的首字母用适当的词语填空。
1. The soldiers are very b_________ .They fear nothing at all.
2. You are late again. Can you tell me the r________
3.Danny c_______ his finger with a knife just now.
4.I have no c__________ to face them. What shall I do
5. You can’t k________ birds from now on. You should protect them.
二.过关
(一)根据句意及首字母提示完成单词
1. One _________（世纪）is one hundred years.
2. The white colour is a _________（象征）of purity（纯洁）.
3.He faced his illness with great__________（勇气）.
4.He is a_________（勇敢的）man.
5. I can only guess the__________（原因）
(二) 完成句子:根据所给中文意思完成下列各句
1. __________________ students is about twenty. (……的数量)
2. It’s _________________ your health. (对……是重要的)
3. The river is polluted and ________________ going dry.(处于……危险中)
4. _________ time went by, she became more and more beautiful. (随着)
5. _____________________ the party, he gave me a gift. (在……之初)
6. The temperature has _______________ below zero. (下降到)
7. It is at the bottom of the ______________. (食物链)
8. You know, computers bring troubles ____________. (也)
【作 业】______________________________
【教学反思】____________________________________