高一英语frightening nature教案5.ppt

Reference for Teaching,I. 异国风情,1. The Grand Canyon,The Grand Canyon (大峡谷) is considered one of the seven wonders of the naturalworld. It is one of America's most famous national parks. Visitors to the canyon come fromall parts of the world. Officials say about 5 million people visit the Grand Canyon eachyear.,The canyon extends 450 kilometers. But the surrounding area does not suggest theexistence of such a large opening in the Earth. Visitors come upon the canyon suddenly,when they reach the edge. Then they are looking at a land like nothing else in the world.Walls of rock fall away sharply. In some places，the canyon walls are more than a kilometerdeep. Far below is the dark, turning line of the Colorado River(科罗拉多河). On the otherside of the canyon, sunshine lights up the rock walls in red, orange and gold. The brightcolors are the result of minerals in the rocks.,Their appearance changes with the light, the time of years and the weather. At sunset,when the sun has moved across the sky, the canyon walls take on quieter colors of blue,purple(紫色) and green. Hundreds of rocky points rise from the bottom of the canyon. Someare very tall. Yet all are below the level of an observer on the edge, looking over. There are several ways to see the Grand Canyon．Many visitors walk along paths,down into t he canyon. It takes several hours to walk to the bottom, it takes two timesas long to walk back up．Some visitors ride mules(骡子)t0 the bottom of the canyon andback．Mules are strong animals that look like horses．They are known for their abilityto walk slowly and safely on the paths．Many people see the Grand Canyon by air．They paya helicopter or airplane pilot to fly them above and around the canyon．Others see it fromthe Colorado River．They ride boats over the fast moving water．These trips can last fromone week to three weeks．,America's National Park Service is in charge of protecting the Grand Canyon fromthe effects of so many visitors．Visitors must carry a11 waste materials out of the area．Allrocks．historical objects，plants and wildlife must be left untouched．The National ParkService tells its visitors，“Take only photographs．Leave only footprints．”,2．The Birth of An Island,Surtsey was born in 1963．It was a great event for scientists．They were lucky enoughto see the birth of this volcanic island．It began at 7：30 a．m．on 14th November．A fishingboat was sailing near Iceland．The boat moved under the captain's feet．He noticed a strangesmell．He saw some black smoke．A volcano was erupting．The bottom of the grey Atlanticwas open．Red—hot rocks，flames and smoke were rushing up from a split in the sea-bed．Theisland grew quickly．It was 10 metres high the next day and 60 metres high on 18thNovember．Scientists flew to Reykjavik to watch．It was very exciting．Smoke and flameswere still rushing up．Pieces of red—hot rock were flying into the air and falling into,the sea．The sea was boiling and there was a strange light in the sky. Surtsey grew andgrew．Then it stopped in June 1967．It was 175 metres high and 2 kilometres long．And lifewas already coming to Surtsey．,Seeds came over the sea. Plants grew．Birds came．Some scientists built a house．They wantto 1earn about this young island．A new island is like a new world．,Ⅱ．知识归纳l. urge的用法,(1)urge常作及物动词，意为：推进，极力主张，强烈要求，催促，劝，激励，怂恿，,强调。

①跟名词,e．g．We Chinese people have persistently urged the equality of nationsbig or small我们中国人民一贯坚决主张国无大小应一律平等They urged direct use of troops to try to suppress the movement．他们强烈要求用部队去设法平息运动②跟带不定式的复合结构,e．g．He urged Wu Dong to help him．他恳请吴东去帮助他Mother urged me not to tell you anything about it．妈妈要求我什么也不要对你说③跟从句[从句用虚拟语气：(should +)动词原形],e．g．They urged that the library be kept open during the vacation．他们主张图书馆在假期开放Her parents urged her that she (should) set strict demands on herself．她父母亲鼓励她要严格要求自己。

④urge后一般不能跟不定式作宾语，只能跟动名词e．g．We all urged sticking to the four fundamental principles．我们大家都主张要坚持四项基本原则2)urge作名词，意为“强烈的愿望(要求)”e．g．He has an urge to join the army．他强烈要求参军3)urge for意为“要求做出”e．g．They urged me for a statement of my view,．他们强烈要求我说出我的观点2．as though(=as if)的用法,as though和as if没有什么区别as if用得普遍些，却可引导方式状语从句和表语,从句，其从句谓语常用虚拟语气1)引导方式状语从句,e．g．He closed his eyes as though he were too tired．他闭着眼睛，好像太累了She acted as though nothing had happened．,她装得好像什么事也没发生过似的。

当从句主语和主句主语一致，从句谓语中又含有动词to be时，可以把主语和to be,一起省去e．g．He looked about as though (he was)in search of something．他四下张望，好像寻找什么He paused as if(he was)expecting Tom to speak．他停了下来好像期望Tom说些什么He listened as though he was turning to stone．这孩子一动不动地听着，仿佛变成了石头似的2)引导表语从句,e．g．It looks as if it's going to rain．看样子天要下雨了。