北师大版Unit22EnvironmentalProtection导学案.ppt

Unit 22 Environmental Protection Lesson one Global Warming 教案,Learning objectives: Understand the text and grasp the language points Learning difficulties: Analyze the long and difficult sentences to improve the comprehensive ability,Step Word spelling adj. : relevant _ 联邦的_ n.: consensus_ hurricane_ 农业_ 光线_ coincidence_ 保护_ substitute_ vt. : 固定_ 注定毁灭 ，宣判死刑_ sacrifice_ 主张，提倡_ 威胁_ 回收利用_ 声称_,Step Language points 1.(原句回放) In the last few decades, scientists have reached consensus and reported that human beings are causing changes in the Earths climate something previously seen as beyond our control. (para. 1) 翻译_ _ 单词：beyond 超 出 短语：超出的控制 _ beyond our control _ beyond belief _ beyond hope _ beyond reason _ 【高考链接】 Sorry, Madam. Youd better come tomorrow because its _ the visiting hours.(福建 2006) A. during B. at C. beyond D. before 句子分析：详见English weekly31期，第二版 2. （原句回放）They claim that in the last 50 years, gases pumped into the Earths atmosphere by the factories and vehicles have been speeding up the process of global warming and affecting our climate. (para. 1) 翻译：_ _ 短语：speed up _ _ 表示从过去某一时间开始一直持续到现在的动作. 分析：本句是个复合句。They claim . 是主句，that in the last 为_的宾语从句。宾语从句的主干结构为：gases have been speeding up the process of global warming and affecting our climate。 pumped into . vehicles (= which have been pumped .)是_作定语修饰gases; have been speeding up . 和affecting(省略了have been) . 是并列谓语。,3. (原句回放)Looking ahead, scientists believe that global warming could be one of the biggest environmental problems facing the 21st century. (para. 1) 翻译：_ _ 分析：在本句中，现在分词短语looking ahead充当_，相当于时间状语从句when scientists look ahead； 现在分词短语facing the 21st century充当_，修饰problems,相当于which are facing the 21st century。 4.Global warming refers to an average increase in the Earths temperature that, in turn, leads to climate change. (para. 2) 翻译：_ _ 短语: 本句中refer to _ in turn _ lead to _这三个短语的意思。 即学即练：1.请不要再提了。 _ 2.学生们依次进行体格检查。 _ 3.他的懒惰导致了他在期末考试中不及格。 _ 5.Without these naturally occurring gases, the suns rays would bounce back into space leaving the Earth cold and impossible to live on.(para. 2) 翻译：_ _ 用法详见学考教程 P6 6.When the presence of these gases in the atmosphere increase, however, more heat is trapped and the Earths temperature rises.(para. 2) 翻译：_ _ 用法详见学考教程 P6,This is no easy task, however, and some governments, for examplae, the USAs federal government, express reservations about whether global warming is really caused by human activities. (para.5) 翻译：_ 用法详见English weekly31期，第二版 Increased temperatures will also cause the polar ice to melt, raising sea levels and flooding many islands and cities. (para. 4) 翻译：_ _ 句子分析：raising sea levels and flooding many islands and cities在此句中作结果状语。,Step. Important phrases 1.展望未来 _ 2.依次_ 3.导致、引起_ 4.采取行动_ 5.在前面_ 6.提到、谈到_ 7.把某事归罪于某人_ 8.参与、起作用_ 9.有关的、相关的_ 10.有责任做某事_ 11.关掉_ Step Multiple choice 1. A greenhouse stays warm because the glass _ the heat of the sun. A. seizes B. traps C. reserve D. recycles 2. The company _ that it is not responsible for the pollution in the river. A. claims B. condemns C. calculates D. demands,3. Jackie was very lazy, and whats worse, he was always late for work, so the boss threatened _ him. A. fire B. firing C. to fire D. to be fired 4. In todays world, the Internet is a very useful tool for _ business communication. A. wrapping up B. growing up C. speeding up D. pulling up 5. If you insist on carrying out this mad experiment, I wont _ the consequences with you. A. carry off B. slow down C. pump into D. answer for 6. Possibly that man died from a heart attack without anyone _ where the treasure was hidden. A. knew B. to know C. known D. knowing 7. _ in the refrigerator, the drug should remain effective for at least three months. A. To keep B. Kept C. Keeping D. Be kept 8. Mr. Baker, our geography teacher, told us that the earth _ around the sun. A. go B. went C. goes D. is going 9. In the last few decades, great changes _ throughout the world, especially