Unit22 Warm-up & Lesson 1　Global Warming—Pre-reading学案（含答案）

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1、 Today rainforests are disappearing from the surface of the globe.Despite growing international concern，rainforests continue to be destroyed at a pace of over 80,000 acres per day.World rainforest cover now stands at around 2.5 million square miles.Human activities have had an effect on much of this

2、 remaining area. Deforestation(滥伐森林) of rainforests has a global effect on species disappearance and the loss of renewable resources.Most people agree that the problem must be solved，but the means are not as simple as building fences around the remaining rainforests or banning the wood trade.Economi

3、c， political， and social pressures will not allow rainforests to continue to exist if they are completely closed off from use and development. So，what should be done to protect rainforests？The solution must be based on what is very practical and depend on developing an approach built on the developm

4、ent of rainforests.Beyond the responsible development of rainforests， efforts to restore damaged forest lands along with protected areas are the key to securing rainforests for the long-term benefits they can provide for mankind. Historic approaches to rainforest protection have failed，as shown by t

5、he increased rate of deforestation.In many regions，closing off forests as untouchable parks and reserves has neither improved the quality of living or economic opportunities for the rural poor，nor stopped forest clearing by illegal woodcutters and developers. The problem with this traditional approa

6、ch to preserving wildland in developing countries is that it fails to develop proper economic motives(动机) for preserving the forest.Local people and the government itself must see economic returns to prove the costs of maintaining(维持) parks from economic activities. 阅读短文，判断正(T)误(F) 1.The damage to r

7、ainforests has caused the loss of renewable resources.(T) 2.Economic returns cant make a difference in protecting rainforests.(F) Warm- up & Lesson 1 Global Warming Pre- reading 匹配左边的单词与右边的汉语意思 第一组 1.trap A.原则，道德准则 2.botanical B.顾问 3.consultant C.使困住 4.reserve D.植物的 5.principle E.保护区 答案 1.C 2.D 3.B

8、4.E 5.A 第二组 6.boycott A.保护 7.corrupt B.一致的意见 8.conservation C.贪污受贿的，腐败的 9.consensus D.超出 10.beyond E.(联合)抵制 答案 6.E 7.C 8.A 9.B 10.D 第三组 11.relevant A.反弹 12.bounce B.巧合 13.agriculture C.迫使(某人)陷于不幸的境地 14.coincidence D.有关的 15.condemn E.农业 答案 11.D 12.A 13.E 14.B 15.C 第四组 16.sacrifice A.代替品，代用品 17.advoca

9、te B.回收利用 18.recycle C.威胁 19.substitute D.牺牲；献出 20.threaten E.主张，提倡 答案 16.D 17.E 18.B 19.A 20.C Step 1 Fast- reading Tell whether the following statements are true(T) or false(F). 1.Global warming will surely be the biggest environmental problem in the 21st century.(F) 2.The temperature of the Earth

10、 depends on carbon dioxide.(F) 3.Without carbon dioxide，we couldnt live on the Earth.(T) 4.Without human beings activities，there wouldnt be global warming.(F) 5.Not just the government but all of us have a responsibility to do something to help reduce global warming.(T) Step 2 Careful- reading Read

11、the passage carefully and choose the best answer. 1.The main purpose of the first paragraph is . A.to introduce the topic of global warming to the readers B.to remind the readers of human activities in the past C.to introduce the greatest trouble in the future D.to mention the process of global warm

12、ing in history 答案 A 2.Which of the following is TRUE about greenhouse gases? A.Greenhouse gases will only do us harm. B.Greenhouse gases do more harm than good to humans. C.Greenhouse gases do more good than harm to humans. D.Proper greenhouse gases are quite necessary to the Earth. 答案 D 3.Which of

13、the following is NOT mentioned as the result of global warming? A.Typhoons. B.Serious diseases. C.Melting polar ice. D.Heat waves. 答案 A 4.Which is the proper order of the following disasters? A.Global warmingflooding islands and citiesrising sea levelsmelting polar ice. B.Melting polar iceglobal war

14、mingrising sea levelsflooding islands and cities. C.Rising sea levelsglobal warmingmelting polar iceflooding islands and cities. D.Global warmingmelting polar icerising sea levelsflooding islands and cities. 答案 D 5.What is the main idea of the last paragraph? A.The USA should play an important part

15、in reducing carbon dioxide. B.Everyone should try his best to save energy and reduce carbon dioxide. C.We must study hard and often do experiments. D.We are suggested that pupils should turn off the lights. 答案 B Step 3 Post- reading After reading the passage，please fill in the following blanks. Can

16、we take the heat? In the last few decades，scientists have reached consensus and reported that human beings are causing changes in the Earths climate.They claim that gases 1.pumped(pump) into the Earths atmosphere by the factories and vehicles have been affecting our climate.But what 2.exactly(exact)

17、 is global warming，why is it seen as a danger，and how is it relevant 3. to our lives? Global warming refers to 4. an average increase in the Earths temperature that， in turn， leads to climate change.Over the last 100 years， the global average temperature 5.has increased (increase) by 1 and many expe

18、rts insist that the blame for this global warming can mostly be pinned on human activities.The link between human activities and 6.rising(rise) global temperatures is not merely a coincidence. A temperature increase of 1 may not sound like a lot，but if we continue to produce carbon dioxide and other

19、 gases in such huge quantities，we 7.are condemning (condemn) life on Earth.Governments all over the world have a responsibility 8.to reduce(reduce) the amount of carbon dioxide.However，some governments express reservations about 9.whether global warming is really caused by human activities.Many peop

20、le believe that they are simply not prepared to sacrifice the amount of money they make from industry to save the Earth.But why wait around for governments to take action？Experts advocate that each person 10.(should) play(play) their part.After all，theres no substitute for our Earth. Step 4 Sentence

21、- learning 1.A temperature increase of 1 may not sound like a lot，but if we continue to produce carbon dioxide and other gases in such huge quantities， we are condemning life on Earth and should expect severe consequences. 句式分析 该句中 but 连接两个并列分句；在后一分句中，if 引导条件状语从句。 自主翻译 气温升高 1 华氏度也许听起来无所谓，但是如果我们继续大量排

22、放二氧化碳和 其他气体，我们将宣告地球生命的终结，并应该能想到其严重的后果。 2.They suggest making small changes like taking public transport，recycling，using low-flow shower heads，and buying light bulbs that use less energy. 句式分析 该句句子的主干是 They suggest making small changes。介词短语 like taking.作 后置定语，四个并列的动名词(短语)作介词 like 的宾语，that use less energy 是定语从句，修 饰先行词 light bulbs。 自主翻译 他们建议做一些小小的改变，比如搭乘公共交通工具，回收利用，使用节水淋 浴喷头，购买节能灯泡。