【提出问题】红红和兰兰平时很喜欢吃乖乖脆果和小鱼多这些膨化食品,她们也通过自己的实验和实践得知,这些像“小枕头”一样的膨化食品袋中充入的气体有些用的是二氧化碳。吃着吃着,她们突然想到,二氧化碳是不能供给人呼吸的,那么向膨化食品袋中充入二氧化碳气体,是不是也想用它来降低食品与氧气的接触,延长食品的保质期呢? Questions raised Red and Lan Lan usually like to eat crispy fruit and fish and more of these puffed foods, they also learned through their own experiments and practices, these like “small pillow ” the same puffed food bag Some of the gas into the use of carbon dioxide. Eat eating, they suddenly thought that carbon dioxide can not provide human breathing, then the puffed food bag filled with carbon dioxide gas, is it also want to use it to reduce the contact of food and oxygen to extend the shelf life of food it?