河北省迁安一中高二英语：book8Uni5：Reading课件2.ppt

Read the text again and get the main idea of the dialogue and then write down the three ways in which the life of early people differs from modern ones. 1. How did they keep warm? They constructed the fires in the center of the caves to keep them warm. They might have kept fires burning all winter. They hung animal skins at the cave mouth to keep out the cold. 2. What animals were their most dangerous enemies? Tigers and bears were their most dangerous enemies. Their clothes were made from animal skins. They used sharpened stone tools to cut up the animals and remove their skin. Then smaller scrapers were used to clean the fat and meat from them. They had to rub an ample amount of salt inside the skin to make it soft enough. Finally, they would have cut it and sewn the pieces together with needles made of animal bones. Some of the necklace beads were made of animal bones but some were made of shells, which tell us that all the fields around here used to be part of a large shallow lake. Perhaps there was trade between early people or they traveled to the seaside on their journeys. 1. alternative n． something that you can choose to do or use instead of something else 替换物 There are some alternatives to our plan. 有几种方案可以代替我们的计划。 a. You must be aware that…主句后接由强调句和定语从句组成的宾语从句。 must是作为情态动词表示肯定推测, 译作“一 定, 肯定”。只用于肯定推测。 对现在或将来事实推测，用 “must do”。 You must be hungry after a long walk． 走了很长的路, 你一定很饿。 对正发生或进行的事进行推测, 用“must be doing”。 The light is on. He must be doing his homework now． 灯亮着, 他一定正在做作业。 对过去的事进行推测, 用“must have done”。 The ground is wet. It must have rained last night. 地是湿的, 昨晚一定下雨了。 此时, 应注意反意疑问句的构成。如果句中有表示过去的时间状语, 反意疑问句用“didn’t+主语”; 如果句中无表示过去的时间状语, 反义疑问句用 “haven’t/hasn’t+主语”。 He must have arrived here last night, didn’t he? 他一定昨晚就来这儿了, 不是吗? He must have arrived here, hasn’t he? 他一定来这儿了, 不是吗? b. aware adj．意识到的, 知道的。