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1、 安徽省滁州市第二中学高中英语 Unit22 Environmental Protection The Twelfth Period Bulletin Board & Unit Diary教案 北师大版选修8Teaching goals 教学目标Exchange the information of the worst disasters in history.Finish Unit Diary.1. Ability goals 能力目标 Enable the students to write about what they know on board. 2. Learning abilit
2、y goals.学能目标 Help the students learn how to assess their learning over the unit.Teaching important points教学重点Help students to form good habits of learning English.Teaching difficult points教学难点How to improve students learning strategiesTeaching methods教学方法 Reading, discussing and summarizingTeaching
3、aids 教具准备Multi-computerTeaching procedures & ways 过程与方式 Step I RevisionCheck the homework. Point out the common errors students have made. Step II AwarenessAsk students to read the three disasters on Page 17. Then they will discuss in groups. Each member will speak out what they know about the worst
4、 disasters. After they discuss what the worst disasters in history are in groups, each of them will write what he or she knows on board. The whole class will exchange their information. If students have an access to the Internet, they may find what they need easily. If they dont, Teacher may provide
5、 some. Tangshan: The Deadliest EarthquakeAt 3:42 a.m. on July 28, 1976, a magnitude 7.8 earthquake hit the sleeping city of Tangshan, in northeastern China. The very large earthquake, striking an area where it was totally unexpected, obliterated the city of Tangshan and killed over 240,000 people ma
6、king it the deadliest earthquake of the twentieth century. What was the biggest earthquake ever?The biggest earthquake known in historical times occurred on 22 May 1960 in Chile, with a magnitude Mw of 9.5. It occurred because of a rupture in the Earths crust that extended horizontally about 1000 km
7、 along the coast of South America; in some places this quake caused vertical uplifts as large as six meters. The second biggest earthquake known, with a magnitude of 9.2, occurred in Alaska on 27 March 1964; it had a rupture length of 800 km, and caused as much as 11 meters of uplift. Theoretical ca
8、lculations suggest that these earthquakes are just about as large as possible for planet Earth. Suppose a hypothetical earthquake ruptures the entire 100 km thickness of the rigid tectonic plates, and suppose this rupture extends along a fault with length 1000 km with an average slip of 10 meters. C
9、alculations show that this hypothetical earthquake would have a magnitude of about 9.3. Larger earthquakes would have to rupture an even longer fault with an even greater average slip; apparently this just doesnt happen. What was the most deadly earthquake ever? The 27 July 1976 earthquake in Tangsh
10、an, China (MS = 7.9) caused the greatest number of deaths of any recent quake known; the most reliable estimates are that about 242,000 lives were lost. Tangshan had a pre-quake population of about a million people; the main industry is mining. One reason the death toll was so high is because most o
11、f the structures in Tangshan were multiple-story, unreinforced brick and concrete buildings. Estimates of loss of life from the worst earthquake disasters are very unreliable; understandably, when tens of thousands of people are dead and most buildings are in ruins, there are more important things t
12、o do than to count bodies. However, there have been about five quakes in the twentieth century where reports of lives lost exceeded 100,000. Most experts accept that the most deadly earthquake in historical times occurred in Shanxi Province, China in 1556; about 830,000 lives were lost. Step III Uni
13、t DiaryGet students to assess their learning over the unit. By completing Unit Diary students will learn what their difficulty is and what they should do to improve. Step IV HomeworkPost your view on how to English well on the Bulletin Board. 附件I.本单元课文注释与疑难解析1. In the last few decades, scientists ha
14、ve reached consensus and reported that human beings are causing changes in the Earths climate something previously seen as beyond our control.在过去几十年里, 科学家一致认为, 人类一直在影响地球气候的变化，这是一种原来被认为是人类所不能控制的现象。consensus: n. a general agreement among the members of a given group or community一致,合意,交感consensus polit
15、ics代表多数人意见的政纲；consensus management代表民意的管理There is broad consensus (of opinion) in the country on this issue. 对这一问题举国上下（舆论）普遍一致.The two parties have reached a consensus. 这两个政党达成了一致意见。“beyond+名词”结构，“出乎胜过、范围、限度”。常见的有：beyond belief (令人难以置信)， beyond ones reach （鞭长莫及），beyond ones control（无法控制），beyond our
16、hope (始料不及)The results have gone beyond our hopes. 结果超出了我们的期望。2. Looking ahead, scientists believe that global warming could be one of the biggest environmental problems facing the 21st century. 展望未来, 科学家们相信, 全球变暖可能是21 世纪面对的最大的环境问题之一。looking ahead是现在分词短语，在句中做状语。look ahead: 往前看；考虑未来Look ahead！What can you see on the top of the hill? 向前看!你看见山顶上有什么东西？I look ahead, and
