Scientists have leamed that Ice Age climates changed from time to time.During periods average temperatures ere probably about t15 degrees F(about-9 to-12 degrees C). (2)Myths and Legends Both myths and legends are traditional stories handed down from earliest times. Although the two words are often used interchangeably.myths are stories about gods and legends sto about men. Myths embody the primitive beliefs of peoples,and provided a romantic explanation of the wonders of nature when scientific explanations were lacking, Natural forces were personified and deified.For example,the Greeks believed that thunder and lightning expressed the displeasure of the great god Zeus. Legends are t connected with so me period in the history of a peopleo nation,often containing an eleme nt of fact.Legends are intended to glorify a hero and tell marvelous deeds he supposedly performed. In Chinese folklore,the story of Da Yu who succeeded in taming the rivers is a legend and the story of Chang'E Flying to the Moon is a myth. Step Two Global reading lents 10 minutes to read the text as quickly as they can,and ask them to think about these questions in the process of reading. 1.Multiple choices P206 2.Structure of the Text Para.1-3 The author puts forward a suggestion that someday we may seek to rea se ou fort and sec rity by building our ho es underground Para.4-12 Para.13 Living underground may be odd but there are more benefits of it. Step Three Detailed study Explain the important and difficult points in the text.including the usage of new words and phra ses,structure of complex t gramma 1.During andrelev the ic e ages,human beings exposed to the c r temperatures of the time would often make their homes in caves be exposed to:be unprotected of unsheltered from(heat,cold,danger,attack,etc.) e.g.Soldiers in an open field are exposed to the enemy's gunfire. Plants exposed to great heat for long periods of time will die 2 There the nfort and s rity tha in the oper 这是一个带有比较 晋从句的句于 ,对不同 的地点 行 cave 和in the open。.比较状语从句中常可以将主句中已出现的成分省略掉。比较状语 从中的would have(done是虚拟语气，表示与过去的事实不相符。 would have aught the bus ossible t at some y we her to ou comfort and security in new,manmade caves add to:increase e.g.The many newly-built first-class hotels have added greatly to he beauty of the city.Scientists have learned that Ice Age climates changed from time to time. During periods of advancing ice, average temperatures were probably about 10 to 15 degrees F (about -9 to -12 degrees C). （2）Myths and Legends Both myths and legends are traditional stories handed down from earliest times. Although the two words are often used interchangeably, myths are stories about gods and legends stories about men. Myths embody the primitive beliefs of peoples, and provided a romantic explanation of the wonders of nature when scientific explanations were lacking, Natural forces were personified and deified. For example, the Greeks believed that thunder and lightning expressed the displeasure of the great god Zeus. Legends are stories connected with some period in the history of a people or nation, often containing an element of fact. Legends are intended to glorify a hero and tell marvelous deeds he supposedly performed. In Chinese folklore, the story of Da Yu who succeeded in taming the rivers is a legend and the story of Chang’E Flying to the Moon is a myth. Step Two Global reading Give the students 10 minutes to read the text as quickly as they can, and ask them to think about these questions in the process of reading. 1. Multiple choices P206 2. Structure of the Text Para. 1-3 The author puts forward a suggestion that someday we may seek to further increase our comfort and security by building our houses underground. Para. 4-12 The author gives four advantages of underground life. Para. 13 Living underground may be odd but there are more benefits of it. Step Three Detailed study Explain the important and difficult points in the text, including the usage of new words and phrases, structure of complex sentences and relevant grammar. 1. During the ice ages, human beings exposed to the colder temperatures of the time would often make their homes in caves. be exposed to: be unprotected of unsheltered from(heat, cold, danger, attack, etc.) e.g. Soldiers in an open field are exposed to the enemy’s gunfire. Plants exposed to great heat for long periods of time will die. 2. There they found greater comfort and security than they would have in the open. 这是一个带有比较状语从句的句子，对不同的地点进行比较，即 there (in caves) 和 in the open。比较状语从句中常可以将主句中已出现的成分省略掉。比较状语 从句中的 would have (done)是虚拟语气，表示与过去的事实不相符。 e.g. It is much colder this week than (it was) last week. If we had been here a little earlier, we would have caught the bus. 3. Is it possible that someday we may seek to add further to our comfort and security by building our houses underground — in new, manmade caves? add to: increase e.g. The many newly-built first-class hotels have added greatly to he beauty of the city