题目

Xing Yuxi， 12， ChongqingI like to have a family group on WeChat. It' s important to have a good relationship with our family members， as we love them more than anyone else in the world.【1】It is nice to communicate with people who know me well.Wang Wenyi， 12， Guangdong【2】For example ， if you have a big announcement（通知）to make to your family ，you can just send a single message to the group instead of contacting each member separately（分开地）. This saves a lot of time.【3】But family groups allow us to share our lives with everyone.Ma Jingwen， 14 ， Sichu相同物质的量的下列有机物充分燃烧，消耗O2最多的是A．C3H4           B．C3H8O          C．C2H6           D．C2H4O2