题目

To Friend or Not to Friend We all love our parents and turn to them when we're in need, but would you like them to hear the conversations you have with your friends on the school playground or lunch queue? Social networking sites have become extensions of the school hallways, so would you add your parents as “friends” and allow them to view your online activities and conversations with friends? In the past the generation gap included a technology gap, where children were up to date with latest technology and parents were left behind, content to continue their day to day lives as the下列属于生态系统的是（ ）A．微山湖B．微山湖的所有植物C．微山湖的所有动物D．微山湖的所有生物