Unit 10 Air【第二課時】【教學目標】1.幫助學生學習Lookand learn中的單詞。2.通過Say and act的情景對話,幫助學生理解核心句型的含義和用法。3.通過對話表演,幫助學生操練句型,引導學生關注環(huán)保和空氣污染問題。【教學重難點】1.詞匯:factory, smoke, dirty, clean, fresh, plant trees2.句型:(1)It makes the air dirty.(2)Trees keep the air clean.【教學準備】課件、音頻【教學過程】I. Pre-task preparations1.學生集體朗讀Listen and say的課文,也可以讓學生介紹空氣,為后續(xù)學習做鋪墊。T: We know that air is very important to us all. Can you tell me why it's important?S1:It keeps things high in the sky.S2: It keeps people, animals and plants alive. (展示一些關于空氣污染的照片,引起學生的共鳴。)T: Yes. Air is so important to us. Look at these photos. Do you think the air is dirty?2.通過提問引入Say and act的對話,導入課文。T: What happens to the air? Ben and Kitty are talking about it. Let's join them. (在學生聽錄音之前,教師設問,讓學生帶著問題聽對話。)T: How do Ben and Kitty feel about the air in different places?What makes the air dirty?II. While-task procedures1.播放Say and act的多媒體動畫,學生觀看動畫后嘗試回答問題。T: How is the air in the street?S1: It's dirty.T: How is the air in the park?S1: It's clean.2.播放課文第一段錄音,學生兩人一組模仿朗讀。教師提出問題,讓學生通過練習對話找出答案。T: Now, let's do a role-play. Act out the first dialogue with your partner. Talk about what makes the air dirty in the street. (把全班學生分成兩大組,分角色朗讀課文。然后讓學生回答問題。)T: Now can you tell me what makes the air dirty in the street?S1: Smoke makes the air dirty.T: Where does the smoke come from?S2: Some smoke comes from the factory.Some smoke comes from cars and buses.T: Yes, that's why the air is dirty. So where can they get clean air?3.提出問題,讓學生帶著問題閱讀第二段的対話,了解空氣潔凈的原因。T: How is the air in the park? What should we do to keep the air clean?4.然后讓學生兩人一組表演對話,表演結(jié)束后回答前面提出的問題。S1:The air is fresh because there are a lot of trees in the park.S2:We should plant more trees and keep the air clean.5.學生完成反饋練習,然后在小組內(nèi)校對答案。III. Post-task activities1.總結(jié)Say and act的核心內(nèi)容,通過提問引導學生回顧本課時所學的主要內(nèi)容。可以根據(jù)學生學力,采用教師提問、學生回答的方式概括本課時內(nèi)容。T: What is this dialogue about?S1: It's about air pollution.S2: Smoke from factories or cars makes the air dirty.S3: It makes people's eyes hurt.T: So what should people do to keep the air clean?S4: We should plant more trees because trees keep the air clean.2.學生朗讀Say and act的對話,然后表演對話。根據(jù)學生的能力,可以讓學生發(fā)揮想象力,改編對話。【板書設計】Unit 10 Airfactory, smoke, dirty, clean, fresh, plant treesIt makes the air dirty.Trees keep the air clean.