Unit 5 Developing ideas (1)课件 2025-2026学年外研版英语八年级下册

Looking into nature Unit 5 英语外研版八年级下册 Developing ideas (1) 通过本课时的学习,学生能够: 1. 听懂关于亚马逊雨林 “沸腾河” 的听力材料,提取关键信息; 2. 掌握单词重音规则,准确朗读多音节词; 3. 运用 “maybe” “perhaps” “It’s likely...”等表达谈论可能性; 4. 了解自然未解之谜,保持对自然的好奇心。 重点 Learning objectives 重点 重点 Nature is full of secrets. They are waiting to be explained. These include black holes, the beginning of the universe, the Loch Ness Monster and Bigfoot. These secrets awaken our curiosity and drive scientists to better understand the wonders around us. Read, match and say Read the text about nature. Read, match and say the black hole 黑洞 the Bigfoot 大脚野人 the Loch Ness Monster 尼斯湖水怪 the beginning of the universe 宇宙起源 Which of the secrets interests you most? The black hole interests me most. I think it's very mysterious. I want to know what is inside a black hole. It drives scientists to explore space and awakens my curiosity. Match the pictures with the secrets. Look and say Do you believe that the water temperature of a river can reach 90 C? Let’s explore! Listen to the talk and choose the correct topic. a A disappearing river in SouthAmerica. b The life of the people in theAmazon rainforest. c A boiling river in the Amazon rainforest. Listen and choose What is it? It is a boiling river as hot as 1_ . What do the local people do with it? They 2_ with it. They clean with it. They make 3_ with it. They sometimes go swimming in it,but only after ⁴_. What's the speaker's opinion? It's one of the most ⁵_of the rainforest. What information should you listen for? facts about the river people’s activities the speaker’s opinion Read and think Listen to the talk again and complete the profile. What is it? It is a boiling river as hot as 1_ . What do the local people do with it? They 2_ with it. They clean with it. They make 3_ with it. They sometimes go swimming in it,but only after ⁴_. What's the speaker's opinion? It's one of the most ⁵_ of the rainforest. 86 cook tea heavy rain amazing wonders Listen and fill Listening for opinions Expressions such as I think, I believe and I guess show people's opinions. Remember: people are sharing their ideas, so you don't have to agree. But you should listen to the other person's opinions and be polite. What’s the speaker’s opinion? Read and underline Phonetics in use Stress in words (1) A word can bestressed on different syllables. If we stress the second syllable, the word is usually averb. For example, present describes the time, while present describes an action. Listen and pay attention to the stress. record a world record / record the temperature produce fresh produce / produce oxygen perfect a perfect gift / perfect her skills desert the biggest desert on earth /desert his duty Learn and listen Listen again and read the words aloud, then mark the stress of each word. record a world record / record the temperature produce fresh produce / produce oxygen perfect a perfect gift / perfect her skills desert the biggest desert on earth / desert his duty / rek d/ /r k d/ / pr dju s/ /pr dju s/ / p f kt/ /p fekt/ / dez t/ /d z t/ Listen and mark Read the table and guess what the conversation may be about. Read and guess The tourists and the guide are having a heated discussion. Let’s listen carefully. Listen to the conversation and complete the table. sunshine heat the river becomes hot 700 kilometres / 700 km in the water produce possible research Listen and fill Why do the tourists and guide have different ideas about the boiling river? How does scientific evidence change our understanding of natural mysteries? Whose opinion do you agree with? Why? The tourists only guess the reasons, but the guide has more facts and knowledge. The guide knows the truth from research. Think and answer Scientific evidence helps us stop guessing. It helps us find the real reasons for natural mysteries. I agree with the guide. Because he has scientific evidence, like the distance of the volcano. Guide: Ancient people here thought that the sun makes the river hot. Boy: It's possible, right? There's a lot of sunshine here. Guide: Actually, it's unlikely for the sun to heat the river that much. Just think of outdoor swimming pools. Would the water get to 86 C in summer? Girl: You' re right. But how about volcanoes? Perhaps the river passes a volcano and becomes hot? Guide: Good guess! But I'm afraid that's not the reason. The nearest volcano is about 700 kilometres away. Girl: I have another idea! Maybe there are some chemicals in the water. They can produce heat. I' ve studied them at school. Guide: That's possible. But scientists haven't found such chemicals in the river yet. They need to do more research... Listen again. Then talk about how the speakers discuss possibilities. Listen and say Learning to learn Talking about possibilities Could, may and might are used to talk about possibilities. Words such as maybe and perhaps are used, too. We can also use the structure It'scertain/ likely / possible that... Read and learn Listen and read. Then act it out in groups. Listen and act out Guide: Ancient people here thought that the sun makes the river hot. Boy: It's possible, right? There's a lot of sunshine here. Guide: Actually, it's unlikely for the sun to heat the river that much. Just think of outdoor swimming pools. Would the water get to 86 C in summer? Girl: You' re right. But how about volcanoes? Perhaps the river passes a volcano and becomes hot? Guide: Good guess! But I'm afraid that's not the reason. The nearest volcano is about 700 kilometres away. Girl: I have another idea! Maybe there are some chemicals in the water. They can produce heat. I' ve studied them at school. Guide: That's possible. But scientists haven't found such chemicals in the river yet. They need to do more research... What unsolved secrets of nature do these pictures show? Crop circles Atlantis Look and say 麦田怪圈,它是田野里出现的巨大圆形图案。 亚特兰蒂斯,大西岛(一座美丽富饶的海岛,据说已沉入海底消失) Yes, it’s very strange. I’m curious about the possible reasons. Have you heard of...? Perhaps it’s because... Choose one unsolved secret of nature and talk about possible explanations. Useful expressions The truth may be... It's likely that... Perhaps it's because... It's probably a result of... There's a (strong) possibility that... It's possible that... There's a chance that... Choose and talk Yes, it’s very strange. I’m curious about the possible reasons. Have you heard of crop circles? Perhaps it’s because some people make them as a kind of art. It's likely that some are made by humans, but others are so big and perfect. There's a possibility that they are caused by unusual weather, like strong winds. The truth may be a mix of both human work and natural forces. Choose and talk Choose one unsolved secret of nature and talk about possible explanations. 1. If you find a new natural mystery, like a strange hot spring or a special rock, how will you study it? I will first observe it carefully and take photos or notes. Then I will ask local people about its stories. Finally, I will check with science books or the Internet to find possible reasons. The best way to understand nature is to observe it, ask about it, and learn from it. Think and say 2. What you have learnt about the secrets of nature? Think and say Nature is amazing and full of mysteries. They awaken our curiosity and make us want to learn more! Nature is full of secrets! Developing ideas (I) Summary We have listened to a talk and a conversation to get information and answer questions. We have learnt about the secrets of nature. We have learnt the stress of words. Find a natural mystery in China, and record its characteristics, possible causes in at least 5 sentences. Tell the story about the Boiling River to friends. Don’t forget to talk about the possible reasons. Need to do Choose to do Homework Blues 61152.0 2025 Blues 115968.0 Blues 147552.0 $