题目

This report presents facts of home computer used by a group of young people. It is a common belief that teenagers today know about  1  and are familiar  2  using them in all their lives. We decided to try to  3  if this was true.   We questioned thirty people between 14 and 18. All the teenagers we  4  said they had computers at home. We asked them how much time they spent on their computers in an average week,  5  we were most interested in 6  they used their computers  7 .    The average time  8  on a computer in a week was about 12 hours, with the highest user average 32 h一种高效食品防腐剂是一种有机物，它的分子结构如图．则：（1）该有机物分子的化学式为________．（2）该有机物C、H、O三种元素的质量比为________；含量最大的是________元素．（3）若该物质说明书上写明：要密封保存、防止受高温加热．据此你推测该物质具有的化学性质是________．