A：酸碱反应生成盐和水，因此与碱反应生成盐和水的物质一定是酸
B：化合物由多种元素组成，因此由同种元素组成的物质一定不是化合物
C：稀有气体的原子的最外层电子数为8（氦除外），因此最外层电子数为8的粒子一定是稀有气体的原子
D：由分子构成的物质内部分子间有间隔，而由原子构成的物质内部原子间没有间隔
句型转换
生物界的基本组成上的高度一致性不能表现在（）
sea, good, home, about, moon, many, doctor, leave, help, go
In the future，life will be much ____. Maybe there will be vision phones in every ____. People can have a medical examination without a ____ or nurse in the room and do some shopping without ____their homes. And what ____education? There will be ____educational programs on the radio or TV. So many children who live in far-away villages don't need to ____to school every day. They can study at home. Each family has a robot. Robots will ____ people do their housework. Perhaps some people will fly to the ____for a holiday and some people can live under the ____.
若5ax＋1bx＋y与3a2b3是同类项，则x、y的值为（ ）
