题目

On the first day of my new high school, I almost had a nervous breakdown. Everything about the school seemed so difficult. When I got home, my parents said, You're nervous and that's okay. Everyone is afraid of high school. I denied it. I wanted to be strong, so I refused to let anyone know about my fear, even my closest friends.        On the first day I was late for every class and was constantly lost. The school seemed like a puzzle that I couldn't figure out. Was this how the whole year was going to be? I didn't think I could rise to this challenge, especially carrying a huge溶液、胶体和浊液这三种分散系的根本区别是 （ ） A．是否大量分子或离子的集合体 B．分散质粒子直径的大小 C．是否能通过滤纸或半透膜 D．是否均一、稳定、透明