为防止甲型H₁N₁病毒在人群中的传播，有人建议接种人流感疫苗，接种人流感疫苗能够预防甲型H₁N₁流感的条件之一是：甲型H1N1病毒和人流感病毒具有相同的:

读图，回答下列问题．

         Life in the 21st century will be different from lire in the 20th century because many changes will take place in the new century．But what will the changes be?   

    The population is  1  fast．There will be more and more people in the world and most of them will live 2than before，because life will be better．3 will be much smaller and more useful，and there will be at least one in every home．And computer studies will be one of the important 4  for students at school．People will have more free time for sports and  5 TV．Travelling will also become  6   because of modern transportation(交通)．There will be changes in our food，too．More land will be used for building new towns and houses．Then there will be less room for cows and sheep，so  7  will be more expensive．Maybe no one will eat it every day．  8 ，they eat more vegetables and fruits．Maybe people will be healthier．Work in the future will be  9  ，too．Dangerous and hard work will be done by robots．Because of this，many people will 10  their jobs. This will also be a problem．

“毛毛虫”与蝴蝶分别是昆虫发育的（　　）