1、Unit 4 Our WorldTopic 1 Which do you like better, plants or animals ?Section Cearth n. 地球；土，泥；大地rainforest n. (熱帶)雨林forest n. 森林Look and learnLook and guess !Look at the pictures and check which questions the passage can answer. What are rainforests?How many animals are living in rainforests?Where d

2、o animals live in rainforests?What can we get from rainforests?Why are rainforests important to us?學習目標1. Learn some new words and phrases: thick, forest, ground, wet, cover, earth, surface, thousands of, control, die out, wood, protect2. Go on learning the structure of comparative and superlative d

3、egrees of adjectives: (1) The plants in the forests help to make the air fresher and cleaner. (2) Rainforests give us wood, food, fruit, medicine, and many more useful things. (3) But now, rainforests are becoming smaller and smaller, so we should protect them.3. Talk about the basic situationaboutt

4、he water resourceand tropical rain forestsand theirimportance to theearth.預習導綱：1、單詞互譯與記憶 1) 茂密的_2) 森林_ 3）覆蓋_ 4) ground_ 5) surface_ 6) control_ 7) protect _2、短語互譯與記憶 1) 成千上萬_ 2) 地球的肺_3) 越來越小_ 4) 在方面起重要作用_5) 滅絕_3、句子理解與熟讀 (1).Rainforests cover 6% of the earths surface. (2)Thousands and thousands of an

5、imals live in the rainforests. (3) The plants in the forests help to make the air fresher and cleaner. (4) They play an important part in controlling the climate. (5) Without rainforests , many beautiful plants and animals would die out.選詞填空 control, cover, beautiful, easy, protect1) Water_most of t

6、he earth.2) Forests can help to make the air fresher. They also help to_the weather.3) We should _ environment to make our cities more beautiful4)Lesson 5 is _than Lesson 65) This rose is _than that one.coverscontrolprotecteasiermore beautiful單項選擇。( ) 1. _ watched the Beijing Olympic Torch Relay(火炬接

7、力） in Zhengzhou. A. Thousands people B. Thousands of people C. Ten thousands people D. Thousand of people( ) 2. Five _ people are waiting for the train. A. hundred of B. hundreds C. hundred D. hundreds of( ) 3. The snake is one of _ in the world. A. the most dangerous animal B. dangerous animal C. t

8、he most dangerous animals D. more dangerous animals( ) 4.The number of wild animals is becoming _ A. much more small B. much more smaller C. smaller and smaller D. small and small( ) 5. The girl is _than the other girls. A. more careful B. much careful C. the most careful D. carefulCCCABWatch the fl

9、ash of 1a, and find out the answers.What can rainforests give us ?視頻1a-P851awood n. 木頭，木材；woods 樹木，森林Rainforests give us rubber n.橡膠Rainforests give us foodmedicineRainforests give us fruitsRainforests give us Listen to 1a and complete the table. Then check with your partner.Feature of rainforestsin

10、 the _ parts of the world_ ground and always _ and _ in themcover _ of the earths _ give a home to many beautiful _ and _Importance of rainforestsmake the air _ and _ _ the water and keep the water_ control the _ keep the beauty of _ give us _, _, fruit, _ and so onhotwetdarkhot6%surfaceplantsanimal

11、sfreshercleanerholdcycling climate naturewoodfoodmedicine1b錄音1a-P851cRead again and answer the questions.What does the word “cover” mean in Paragraph 1 ?Why are rainforests the lungs of the earth ?It means “覆蓋”.Because the plants in the forests help to make the air fresher and cleaner.1cRead again a

12、nd answer the questions.3. Why should we protect rainforests well ?4. Can you guess what the next part of the passage will talk about ?Because they help to hold the water and keep the water cycling. They play an important part in controlling the climate.Yes. The next part may talk about what we shou

13、ld do to protect rainforests.The last sentence in a paragraph may tell you what comes next.1cRead again and answer the questions.5. What should we do to protect rainforests ?We should save paper and mustnt use the chopsticks for only once.Rainforests cover 6% of the earths surface.six percentKey poi

14、nts數詞 % +of+可數名詞復數可數名詞單數 / 不可數名詞 Eg: 50% of the students in our class are boys. 70% of the earth is water.成千上萬的成百上千的成百萬上千萬的，數以百萬計的hundreds ofmillions ofThousands and thousands of animals live in rainforests.【鏈接】兩千本書 two thousand books ； 四百個學生four hundred students思考：“與具體數字相連時”，hundred，thousand后面是加s，還

15、是不加s ？_ 幾千人 a few/ several thousand people (注意：thousand有沒有加s)思考：hundred，thousand被_和_修飾時，hundred，thousand不加s。3. Many of them live in the trees over 30 meters from the ground. over = more than 多于， 超過 eg: Our class has _ 50 students.4. They play an important part in controlling the climate. play an imp

16、ortant part ( in sth.) 在某事中起重要作用； 參與（某事） Eg: 他積極參加班級活動。 He _ class activities. over/more thanplays an active part in 5. But now rainforests are becoming smaller and smaller.“形容詞比較級 + and + 形容詞比較級” 越來越Eg. 天氣變得越來越暖和了。The weather gets warmer and warmer. 中國變得越來越強大。China becomes stronger and stronger.越來越

17、小思考:當多音節的形容詞表達“越來越”時，該如何表達? _ _ _ + _【練一練】：越來越漂亮_； （beautiful） 越來越重要_； （important）Group workDiscuss the pictures in groups about how to protect rainforests. Then write a short passage. show and tell people about do anything we can，such as ask people not to ask people not to cut Lets plant You can wr

18、ite like this :Example : Rainforests are very important to us. It is necessary for us to protect them very well. First, we should make people know about the importance of protecting them. Then ask people not to cut down the trees without plans. For us, we should do something as possible as we can. W

19、hen we have meals, we mustnt use chopsticks for only once. In the life, use less paper and be sure not to waste it. 快速閱讀。 Do you know why different animals or pests (害蟲) have their special colors？Colors on them seem to be used mainly (主要地) to protect themselves. Some birds like eating locusts (蝗蟲),

20、but birds cannot catch them easily. Why? Because locusts change their colors according to the colors of crops (莊稼). When crops are green, locusts look green. But as the harvest time comes, locusts change to the same brown color as crops have. Some other pests with different colors from plants are ea

21、sily found and eaten by others, so they have to hide (隱藏) themselves and appear (出現) only at night. If you study animal life, youll find the main use of coloring is to protect themselves. Bears, lions and other animals move quietly through forests. They cannot be easily seen by hunters (獵人). This is because they have colors much like the trees. A kind of fish in the sea can send out a kind of very black liquid (液體) when it faces danger. While the liquid spreads o