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19.A.The likely reason of global warming
B.Global warming-a world problem
C.The fast increase in recent years
D.What we should do to avoid greenhouse gases producing
E.The earth is becoming warmer
F.Different opinions on the cause of global warming
61.E
Is the world warming up?According to many reports,the answer is yes.Eleven of the hottest years since 1850appeared between 1995and 2006.Last year,the United Nation's Intergovernment Panel on Climate Change (IPCC) reported the earth was about 0.75℃warmer than it was in 1850.While this doesn't sound like a lot,a small difference in average temperature can make a big difference in climate.During the last Ice Age,the planet was only about five degrees colder than now.
62.C
It's all about the speed at which temperatures are changing.In the past,temperatures moved up or down step by step.But in the 20th century,especially since 1976,temperatures have likely risen more quickly than during any century in the last 1000years.Warming may bring improved harvests to northern countries such as Canada and Russia.However,many species won't like these conditions.They begin moving towards cooler places and cause lots of trouble to human world.
63.A
The IPCC reported that human activity is very likely responsible by increasing the greenhouse effect.Some gases cause the air to take in heat energy.Without the greenhouse effect,the earth's average temperature would be-18℃rather than the present comfortable 14.6℃.The main greenhouse gases are carbon dioxide,water vapor and some other gases.Burning oil,coal and waste adds to the carbon dioxide,and it has increased 35% since 1850.
64.F
Many researchers have found that natural forces alone don't explain the temperature increases over the last 30to 40years.Their study shows that as carbon dioxide goes up,temperature will rise,too.But some scientists don't agree.They think the effect of human produced greenhouse gases is very small compared to the normal changes that the climate causes.
65.D
When asked whether humans are causing the world warming,Carl Wunsch,a professor at Massachusetts Institute of Technology says,"It seems very likely from what I've seen.Is it 100% sure?No.There is something to do with natural changes."Does that mean we should have a"wait-and-see"attitude?Not according to Wunsch.He points out we buy house insurance not because we are sure our homes will be on fire,but because it's a danger we'd rather avoid.

分析 文章分别介绍了全球变暖,尤其近些年上升幅度更快的事实以及原因,学者的不同看法,以及呼吁,倡导大家采取行动

解答 61-65 ECAFD
61.E 抓住关键句,Is the world warming up?According to many reports,the answer is yes.句意:世界变暖了吗?根据许多报道,答案是的,the earth was about 0.75℃warmer than it was in 1850.地球比1850年高0.75度,所以此部分是The earth is becoming warmer
地球变得更暖和了,所以选E,
62.C文章细节,In the past,temperatures moved up or down step by step.But in the 20th century,especially since 1976,temperatures have likely risen more quickly than during any century in the last 1000years.过去,温度是逐步上升,但在20世纪,尤其自从1976,气温比过去100年任何时候的温度上升都快,所以选C,The fast increase in recent years
63.A 深层理解,human activity is very likely responsible by increasing the greenhouse effect人类活动通过增加温室气体是要负责的.Burning oil,coal and waste adds to the carbon dioxide.燃烧的油,煤和废弃物也增添了二氧化碳,所以此部分是造成全球变暖最主要的原因,故选A.
64.F 抓住关键句,Many researchers have found that natural forces alone don't explain the temperature increases over the last 30to 40years.许多研究人员发现自然力不能解释过去30,40 年温度的增加,But some scientists don't agree,但一些科学家不赞同,因此可见是对全球变暖原因的不同观点,不同见解,Different opinions on the cause of global warming,所以选F,
65.D理解归纳,Does that mean we should have a"wait-and-see"attitude?.He points out we buy house insurance not because we are sure our homes will be on fire,but because it's a danger we'd rather avoid全球变暖不全是人为因素,是不是意味着人就旁观呢,学者打了个比方,我们买房险,不是我们确信我们房子会着火,而是因为我们想要避免风险,可见是人们发出呼吁,倡导大家拿出行动的时候了,所以选DWhat we should do to avoid greenhouse gases producing

点评 本文考查了考生的归纳整理能力,要求能抓住段落中的中心句和关键词准确的把握段落大意.要求抓住文章和主旨相关的关键句,进行归纳.

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