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阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。 Swedish businessman Nile Bergqvist is delighted his new hotel, the world's first igloo(冰屋) hotel. (build) in an small town, it has been attracting lots of visitors but soon the fun will be over. In two weeks' time Bergqvist's ice creation (be) nothing more than a pool of water. “We don't see it as a big problem, ”he says. “We just look forward to (replace)it. ” Bergqvist built his first igloo in 1991 for an art exhibition. It was successful that he designed the present on二氧化碳在下列哪项中浓度最高（ ）A．肺泡B．组织细胞C．肺泡外毛细血管D．血液