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Penguins are good swimmers, and they are very good at swimming in the sea. They can dive much deeper than people. Some people can dive about 180 metres, but most people can only dive about 30 metres. Penguins can dive 500 metres. That is a long way down! Do you know the TV Tower in Shanghai? That is 468 metres high.

 Penguins can hold their breath much longer than people.Some people can hold their breath for about five minutes, but most people can only hold their breath for one or two minutes. Penguins can hold their breath for 20 minutes.

Many whales can hold their breath longer than penguins. Some whales can hold their breath for about two hours!

如果某一种昆虫，缺乏适应变化着的环境所需要的变异，它可能（   ）

2015年10月5日我国科学家屠呦呦获得诺贝尔生理医学奖，作为民族的骄傲 ，浙江省加大对屠呦呦旧居的保护，把它列为历史文化名城名镇名村、传统建筑抢救保护工程。这样做是因为（   ）

①文化对人的影响来自于特定的文化环境，离不开物质载体

②文化的经济功能越来越强

③文化遗产是一个国家和民族历史文化成就的重要标志

④它可以集中展示民族文化、集中表达民族情感

某同学把七种动物分成鲸、麻雀、袋鼠和蟹、蝴蝶、乌贼、蚱蜢两类。他可能是根据什么特征来进行分类的？（ ）
①体温是否恒定   ②是否有脊椎骨   ③卵生还是胎生    ④水生还是陆生

说明诗《短歌行》中所用典故的含义。