题目

寒假即将来临，Linda给旅行社写了一封信，咨询有关假期旅游的情况，其中有几个词打不出来。请根据中文意思将这封信补全。 Dear Dream Travel, My family and I hope to take a trip this winter somewhere in southern China. We want to go somewhere that is warmer and   61   (更干净) than our city. It would be better if it has some fantastic    62   (风景). And we’d like to go on a train or a   63   (飞机), but we don’t want to drive our car because that will make us too     64   (累的). We enjoy hiking, camping,  �汽油的热值是4.6×107J/kg，表示     ．现有汽油500g，若燃烧一半，剩余汽油的热值将     ．