选择填空。

天  北  颐和  圆明  景  香

①北京的公园可多啦，有____园、____园，还有____坛、____海、____山、____山……

中华  首都  长  故  人民  国家

②北京有世界闻名的古代建筑____城、____宫，还有著名的现代建筑____大会堂、____图书馆、____世纪坛、____国际机场

    I think that the world will be an easy place to live in. We1have machines and robots and they will2us do all the3jobs, and we don't have to do things4washing dishes and5the beds, though we won't have any dishes at all. Maybe we will just throw the dishes away after each meal. I6that doctors will be able to7us alive8a long time. I hope that when I am 80 years old, there9something that can keep me alive for1080 years, so I will live to be 160 years old.

大多数鸟类体内具有气囊，气囊在鸟飞行时所起的作用不包括（　　）