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【由2017届广西桂林中学高三8月月考改编】 语篇语法填空。阅读下面材料，在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式。 A: Welcome to the Zhoukoudian caves here in China. It is () _______ great pleasure to meet you students from England, who are interested in archaeology. You must be aware that it’s here (2) _________ we found evidence of some of the earliest people who lived in this part of the world. We’ve been excavating here for many years and … S1: I’m sorry (3) __________ (interrupt) you but how could they live here? There are only rocks and trees. A: Good questions. You are an acute (4) __________(observe). We have found human and animal bones in those caves higher up the hill as well as tools and other objects. So we think it is (5) _________ (reason) to assume they lived in these caves, regardless of the cold. S2: How did they keep warm? They couldn’t have mats, blankets or quilts like we do. It must have been very uncomfortable. A: We’ve discovered fireplaces in the center of the caves (6) _______ they made fires. That would have kept them warm, cooked the food and scared wild beasts away as well. We have been excavating layers of ash almost six meters thick, which (7) ___________(suggest) that they might have kept the fire burning all winter. We haven’t found any doors but we think they might have (8) _________(hang) animal skins at the cave mouth to keep out the cold (9) _________ the freezing winter. | 
