人教版（2019）选择性必修第三册Unit 3 Environmental Protection Reading and Thinking 学习任务单-

Unit 3 Environmental Protection Reading and Thinking-任务单
课程基本信息
课题 Unit 3 Environmental Protection Reading and Thinking
学习目标
In this class, students will: To have a better understanding of climate change and global warming； To analyze main ideas, genre, structure, methods and language features of the passage; To be able to apply reading skills to appreciate exposition passages.
课前学习任务
Climate Change Requires World’s Attention We have known about climate change for decades. ____1____A warming ocean and atmosphere along with melting ice and rising sea levels provide evidence of a dramatic change in the global climate. In 2013, a lot of people were shocked by a news photo of a dead polar bear that was found on Norway's Arctic island of Svalbard. According to the scientists who found its dead body, all that remained of the polar bear was "skin and bones". An expert who has studied polar bears for many years said that from the position of its dead body, the bear appeared to have starved and died. Experts claimed that low sea-ice levels caused by climate change meant the bear could not hunt seals as before, so it had to travel greater distances in order to find food.____2____ Then what is causing the increase in the global average surface temperature Climate scientists often mention a key climate process called the "greenhouse effect", which has two common meanings: the "natural" greenhouse effect and the "man-made" greenhouse effect. The "natural" greenhouse effect refers to the fact that heat from the sun enters the atmosphere and warms Earth's surface as short-wave radiation. The heat is released back into space at longer wave lengths. Greenhouse gases in the atmosphere, such as methane and carbon dioxide, trap some of the heat, keeping Earth's climate warm and habitable. Without this process, Earth could not sustain life.____3____ When people produce huge amounts of extra greenhouse gases by burning fossil fuels, more heat energy is trapped in the atmosphere and causes Earth's surface temperature to rise. ____4____ Climate scientists have warned that if we do not take appropriate actions, this warming trend will probably continue and there will be a higher price to pay. In fact, news reports are frequently broadcast about extreme rainstorms and heatwaves causing deaths and economic losses. Continued greenhouse gas emissions will result in further warming and long-lasting changes to the global climate. This requires the attention of people all over the world. Governments need to consider making policies and taking appropriate actions and measures to reduce greenhouse gas emissions. ____5____ It is our responsibility to seize every opportunity to educate everyone about global warming, along with its causes and impacts, because this is the most serious issue affecting all of us on this planet. So what will you do to help We as individuals can also reduce our "carbon footprint" by restricting the amount of carbon dioxide our lifestyles produce. B.There is little doubt that Earth is getting warmer and warmer. C.There is strong and comprehensive evidence that the rise in temperature has led to an increase in extreme weather and natural disasters worldwide, not only causing serious damage, but also costing human lives. D.However, the "man-made" greenhouse effect has now become a big problem. E.Global warming contributes to the melting of glaciers on the earth. F.Large-scale climate change has been reported in recent years. G.This alarming case showed how the increase in temperature had an impact on ecology.
课上学习任务
【Task 1】Lead-in What happened to the animal in the picture Why 【Task 2】Gap-filling and summarize main ideas Check the answers of gap-filling exercise assigned before class Summarize the main idea of each paragraph Para. 1The e _______ of climate changePara. 2The s________ of a dead polar bearPara. 3The c________ of climate changePara. 4The e________of climate change Para. 5The s________ to climate change
【Task 3】Read for structure Which is the structure of the passage A. B. C. D. 【Task 4】Read for genre What type of writing is this passage A. Argumentation (议论文） B. Narration（记叙文） C. Exposition (说明文） D. Description(描写文) 【Task 5】Read for mind-mapping Could you please finish the following mind-mapping 【Task 6】Read for methods What exposition methods does the passage apply \ _________________________. _________________________. _________________________. 【Task 7】Read for language features 1. (evidential /humorous/objective/subjective) 2. (brief/wordy/plain/vivid) 3. (clear/unclear/organized/disordered) 【Task 8】Summarize and comprehend How to read an exposition passage 【Task 9】Practice and present What is the structure of this passage What is the genre of this passage What are the methods applied by the author Circle some adjectives from the following table to describe the language features