Unit 3 A helping hand （Discovery）课件2025-2026学年沪教版（五四学制）英语七年级下册

第六课时 Unit 3 Discovery A helping hand 初中英语沪教版（五四学制）七年级下册 Learning objectives 通过本课时学习，学生能够： 1. 获取有关求助信号SOS以及聋哑人如何用手语向别人寻求帮助的 信息； 2. 运用阅读技巧获取关键信息，能够准确回答与文本相关的问题； 3. 思考并尝试发现其他可能的求救信号及其应用场景； 4. 增强安全意识，认识到求救信号在紧急情况下的重要性。 重点 重点 Watch and answer What is the woman talking about? She is explaining SOS. Look and answer 1. Do you know what’s in the picture? Morse Code (摩尔斯电码) Morse code is a way to send messages using short and long signals. These signals are called dots (.) and dashes (-). Each letter of the alphabet and each number has its own combination of dots and dashes. 2. Can you write the Morse code for SOS based on the picture? S O S ···---··· dashes dots Look and write Look and write 3. Can you write the Morse code for HELP based on the picture? HELP ···· · ·-·· ·--· Look and find 4. Can you find the letters represented by “191519” in the picture? 19 15 19 S O S Look and write 5. Can you write down what these numbers represent? 0308091401 0912152205251521 China I love you SOS The best-known signal for help may be “SOS”. It’s an international signal that can be used in any emergency. It comes from the Morse code, which uses dots and dashes, so it’s not the short form of any English words. However, it does have a less-known form— “191519”, which are the positions of “S”, “O”, “S” in the 26 English letters. Skim and answer Signals for help Skim the text and answer the question. Sign languages for the deaf-mute Sign languages allow the deaf-mute to ask for help, but they vary from country to country. In China, showing your palms out and flapping twice means “help”, but in America, you have to put a thumb up on your other palm to deliver the same message. What two signals for help can you find in the text? Read and answer Read SOS and answer the questions. 1. Where does the SOS signal come from? 2. What does Morse code use? 2. Is SOS the short form of some English words? 3. What does “191519” represent in the text? How can we send Morse code in our daily life? It comes from the Morse code. No, it’s not the short form of any English words. The positions of “S”, “O”, “S” in the 26 English letters. It uses dots and dashes. Think and share How can we send Morse code in our daily life? Dot (.) is represented by a short sound or tap (e.g., a brief tap). Dash (-) is represented by a long sound or tap (e.g., a longer tap). 1. Using Sound For example, the letter A (.-) is: Dot (.) = short tap. Dash (-) = longer tap. 2. Using Light Signals Dot (.) is a quick flash of light. Dash (-) is a longer flash of light. For example, the letter S (…) would be three quick flashes of light. 3. Using Gestures Dot (.): A short hand movement. Dash (-): A longer hand movement. 4. Using Text You can also send Morse code by typing it out on paper or through electronic devices. Simply look up the Morse code for each letter or number and write it down. Read and match China America Read sign languages for the deaf-mute and match the picture with the country. HELP Read and answer Read again and answer some questions. 1. What allow the deaf-mute to ask for help? 2. Are sign languages the same all over the world? 2. How can you use sign language to show “help” in China? 3. How can you use sign language to show “help” in America? Can you use Chinese sign language and American sign language respectively to express “help”? Sign languages. Show your palms out and flap twice. Put a thumb up on your other palm. No, they vary from country to country. Discuss and share 1. Why might China and the US use different sign languages? 2. What problems could happen if you use the wrong gesture abroad? SOS The best-known signal for help may be “SOS”. It’s an international signal that can be used in any emergency. It comes from the Morse code, which uses dots and dashes, so it’s not the short form of any English words. However, it does have a less-known form— “191519”, which are the positions of “S”, “O”, “S” in the 26 English letters. Let’s read Signals for help Let’s read the text loudly together. Sign languages for the deaf-mute Sign languages allow the deaf-mute to ask for help, but they vary from country to country. In China, showing your palms out and flapping twice means “help”, but in America, you have to put a thumb up on your other palm to deliver the same message. Discuss and share Do you know any other signals for help? Body signals For example, raise your arms above your head, and keep swinging and waving, especially when you see a rescue plane passing by. Smoke or fire: Covering the fire with some green branches with water will produce white smoke, which can be seen several kilometres away. If rubber is added to the fire, black smoke will be produced. Shouting or calling for help Calling out “Help!” in a loud, clear voice is one of the most basic and direct forms of signaling for help. Three short whistle blasts Blow a whistle or make a loud sound (e.g., using a horn) in three short bursts, followed by a pause, and repeat. Discuss and share Do you know any other signals for help? Using a “help” flag A flag (or any brightly colored cloth, shirt, or object) can be used as a signal for help. The person waves it in the air to attract attention. Mirror signal A small mirror or any reflective surface can be used to reflect sunlight, creating a visible flash that can be seen from a distance. Night signal A glow stick or flashlight can be used to create visible light that attracts attention. At night, a flashlight can be flashed in SOS patterns. Ground signal You can create large ground signals that can be seen from the air, such as spelling out SOS with rocks, logs, or any other materials. Role play Work in groups to choose one of the emergency situations, use your knowledge to send out signals for help, and act it out. A (the injured): My leg is bleeding! We need to send a signal for help. B (the captain): Use the flashlight! Three short, three long, three short—that’s SOS in Morse code! C: ... Summary 2 After learning this lesson, I can 1 send signals for help when I’m in an emergency situation. know some signals for help. Homework 1. Gather more information about the signals for help, which can be texts, pictures or videos, and share it in the next class. 2. Write a short article under the title of Signals for Help, and list at least three different signals for help and how they are used. Bye-bye! EVCapture4.2.2软件录制 Lavf57.25.100 本视频由湖南一唯信息科技开发的EV录屏软件录制，www.ieway.cn $