题目

It was a comfortable sunny Sunday. I was going to meet an old university friend I hadn't seen for years, and was really excited.My train was running a little late, but that was no big problem - I could text him to say I would be delayed. He would understand. But… where was my mobile phone? I had that familiar sinking feeling. Yes, I'd left it at home.No mobile phone. I'm sure I'm not alone in feeling anxious, on edge and worried when I don't have my phone with me. In fact, I know I'm not alone: two-thirds of us experience ‘nomophobia’ (无手机恐惧症), the fear of being out of mobile下列图形中不是中心对成图形的是（　　）A．正方形B．平行四边形C．菱形D．三角形