题目

阅读理解Myfamily just got back from a wonderful vacation. It was 10 days of good food,great sun and beautiful beaches. One day nearly ruined our trip, though. I hadcaught a bad cold, and I was thinking about staying at home. But my wife hadher heart set on the beach, and because we have three small children, I camealong to help out. Wearrived, and my wife was in heaven. I wasn't as enthusiastic. The sand wasn'tnearly as soft as I like. And the surf was much rougher, which certainly didn'tplease my kids. AsI kept comparing this beach to other ones, my mood deteriorated. I wasabout to get in小明在观察课本实验“燃烧的条件”（如图甲所示）时，对产生的大量白烟产生了疑问．于是查阅资料：…产物是白色固体--五氧化二磷．五氧化二磷会刺激人体呼吸道，在空气中可能与水蒸气反应，生成一种剧毒物质--HPO3（偏磷酸）．由小明查阅的资料看，他最初的疑问可能是：________．分析：五氧化二磷和偏磷酸都会伤害人的身体，应对此实验进行改进．【实验改进】小明与同学一起对课本实验进行了如下的改进（如图乙所示）：去掉铜片，将足量的红磷和白磷分别放在两个大试管中，试管口各自套一个瘪气球，用线固定．然后将两只大试管同时浸在盛有热水的烧杯中．【观察现象】可观察到试管中________，此反应的化学方程式为________；气球的变化是：________．【得出结论】可燃物燃烧必须具备的条件是：________．【反思与评价】改进后的装置与原装置比较，其优点是：________．【实验创新】发生燃烧反应的试管冷却后，小明将试管倒立在水中（试管口接近水面），捏住气球口部，小心取下气球，观察试管中的现象是：________，小明进行此实验的目的是：________．