1、第一学时 Reading and Comprehension,Global warming,1What is the greenhouse made of and used for? 2How does it work? 3What are the “greenhouse gases”？ 4What do you think greenhouse gases do? 1A greenhouse is made of glass and is used for growing plants，especially during cold weather. 2The air inside is wa
2、rm because the glass traps the heat from the sun and keeps it from escaping.This makes the greenhouse heat up and so the plants can grow throughout the cold period. 3In the atmosphere surrounding the earth there are gases，which are called“greenhouse gases”， including carbon dioxide，methane(甲烷，沼气) an
3、d water vapor. 4They trap heat from the sun and therefore warm the earth.,Task 1,快速阅读课文The Earth is Becoming Warmer But does it Matter？，用大约30词写出课文的概要。 温馨提示：本文属于说明文，它主要以说明为主要表达方式来解说事物，阐明事理，给人以知识。写概要时要注意说明的对象。(另外这篇文章还包括了人们对全球变暖的这一问题的不同观点。) _ 答案：In the passage，Sophie Armstrong explores the questions on
4、 how human activity creates“greenhouse gases”which directly leads to the global warming，and shows us the different attitudes among scientists towards global warming.,Task 2,仔细阅读The Earth is Becoming Warmer But does it Matter？选择正确答案。 1The text mainly discusses_. Awhen the “greenhouse effect” started
5、Bwhat causes the “greenhouse effect” CDr.Janice Fosters theory on the“greenhouse effect” Dthe fact that the earth is becoming warmer and different theories about it,D,2All the followings are true EXCEPT_ . Aeveryone believes that global warming is caused by human activities Bcarbon dioxide is a bypr
6、oduct of burning fossil fuels Cpeople accept Charles Keelings data because he took accurate measurements Dnot all the scientists agree with each other on the effect of the global warming,A,3The main difference between Dr.Janice Fosters theory and George Hambleys lies in_. Ahow to prevent global warm
7、ing Bwhat causes global warming Cwhether global warming would cause serious problems or not Dwhether the levels of carbon dioxide have increase or not over the years,C,4“But there are some very different attitudes among scientists towards this issue.” “Issue” here means the same as the one in“_” AI
8、bought the new stamp the day of its issue BThis is a big issue；we need more time to think about it CShe is always on a dietshe has issues about food DThe magazine has 12 issues each year,B,5What may happen if we do nothing about global warming? （ ） AThere may be a rise of the sea level. BThe tempera
9、ture will surely be lower. CThe“greenhouse effect” will disappear. DIt has nothing to do with us.,A,Task 3,再次阅读 The Earth is Becoming WarmerBut does it Matter？然后完成下列表格。,1fossil fuels 2.produce energy 3.carbon dioxide,4.add 5.up 6.sea level 7.floods 8.droughts 9.quicker 10.more,Task 4,根据课文 The Earth
10、is Becoming WarmerBut does it Matter？完成下列短文。 There is no doubt 1_ the earth is becoming warmer but there is a fierce debate over whether it is human activity that has caused this global warming or whether it is just a natural phenomenon. Many scientists like Dr.Janice Foster believe that people have
11、 caused the increase in the earths temperature 2_ the burning of fossil fuels like coal，natural gas and oil to produce energy 3_ byproducts are called “greenhouse” gases，the most important one 4_ carbon dioxide.These gases trap heat from the sun and therefore warm the earth，without which,the earth 5
12、_ (be) about thirtythree degrees Celsius cooler than it is.But increased amount of carbon dioxide means that 6_ heat energy is trapped in the atmosphere 7_ (cause) the global temperature to go 8_.On 9_ other hand，scientists like George Hambley believe that any warming will be mild with 10_ bad envir
13、onmental consequences and more carbon dioxide is actually a positive thing.1that 2.through 3.whose 4.being 5.would be 6.more 7.causing 8.up 9.the 10.few,一、请将课文The Earth is Becoming WarmerBut does it Matter? 翻译成汉语，然后对照“译文助读”自主勘误。 译文助读 全球在变暖这会带来什么影响吗？ 在20世纪期间，地球温度大约升了华1氏度。这个数值对你我来说很可能是无所谓的，但是跟其他自然变化相比
14、较而言，这却是一种快速的增长。那么，这种温度的增长是怎么产生的呢？会产生什么影响呢？“关爱地球”组织的索菲阿姆斯特朗就在探究这些问题。毫无疑问，地球是在变暖(见图一)，而地球变暖正是人类活动导致的，并非是一种无规律的自然现象。,图1：18602000年长期平均温度差,所有的科学家都赞同这种观点：人们为了生产能量而燃烧化石燃料(如煤、天然气和石油等)，从而引起了地球温度的升高。这个升温过程的一些副产品就叫做“温室”气体，其中最重要的就是二氧化碳。贾尼丝福斯特博士解释说：“有一种科学家称之为温室效应的自然现象。这种现象的发生是因为在大气层中少量的气体(如二氧化碳、甲烷、水蒸汽等)吸收太阳的热量，从
15、而使地球变暖。如果没有这种温室效应，地球的温度将比现在的温度还要低33摄氏度左右。因此，我们需要这些气体。当我们的大气层中增加了大量额外的二氧化碳时，问题就来了。这意味着更多的热量要被困在大气层中，从而引起全球温度上升。”,我们知道，在过去100150年期间，二氧化碳的含量急剧增加了。有一位名叫查尔斯基林的科学家曾经把19571997年期间大气层中二氧化碳的含量作了精确的统计。他发现，在这些年里，大气层中的二氧化碳含量从315/1000 000上升到370/1000 000。(见图二)所有科学家都接受这个数据。他们还赞同下述观点，正是由于越来越多地燃烧化石燃料导致了二氧化碳的增加。那么气温会升
16、多高？福斯特博士说，在今后的100年里，全球变暖的量可能低到11.5摄氏度，但是也有可能会高达5摄氏度。,图2：19571997年大气中的二氧化碳含量,然而，科学家们在对待升温的态度上却是大不相同的。一方面，福斯特博士认为气温升高5度的趋势可能是一场大灾难。她说：“对于未来的气候，我们不可能作出精确的预测，但是那时的天气可能是很糟糕的。”同意她的观点的其他科学家认为，全球变暖会导致海平面上升好,几米；也有人预言会出现严重的风暴、洪涝、干旱、饥荒、疫病和物种的灭绝。另一方面，还有一些人，像科学家乔治汉布利，反对上面的观点，他们认为我们不必担心空气中会有高含量的二氧化碳。他们预言说，变暖的情况不会
17、很严重，对环境的影响也不会太坏。汉布利实际上是这样说的：“二氧化碳含量的增加实际上是件好事。它使植物生长更快，庄稼产量更高，还会促进动物的生长所有这些都能改善人类的生活。”温室气体继续在大气中聚集。即使我们开始减少二氧化碳和其他温室气体的含量，在(未来)几十年或几个世纪内，气候仍会持续转暖。没有人知道全球变暖会带来什么样的影响。这是不是意味着我们不必采取任何措施呢？还是说，这样不采取任何措施危险性会很大呢？,二、将下列单词或词组译成英语然后参阅Unit 4的词汇表自主勘误。 1消费，消耗 v_ 2图表 n_ 3现象 n_ 4资料，数据 n_ 5趋势 n_ 6大灾难 n_ 7洪水 n_ 8温和的 adj._ 9结果，后果 n_ 1consume 2.graph 3.phenomenon 4.data 5.tend 6.catastrophe 7.flood 8.mild 9.consequence,10陈述，说明 v_ 11种类，范围 n_ 12发生，造成_ 13同意，赞成，订阅_ 14大量的_ 15上升，增长_ 16导致_ 17反对_ 18即使_ 10.state 11.range e about 13.subscribe to 14.quantities of 15.go up 16.result in 17.be opposed to 18.even if,祝,您,学业有成,
