题目

My favorite physicist (物理学家) is Qian Xuesen. He was born in Shanghai on December 11, 1911. He was a little fat and of medium height. And his eyes were wise. He liked music, art and science (科学).He studied the important implementation (实施) plan for the Chinese rocket (火箭) and the missile (导弹). He worked very hard for our country. I liked him very much.Qian Xuesen had famous words: I am very tiny (微小的). It is the Chinese people that are truly great!Qian Xuesen died on October 31, 2009. I’m very sad to hear the news, and Chinese people are the same as me. He is our下列属于人工生态系统的是（　　）A．河流生态系统B．草原生态系统C．湿地生态系统D．城市生态系统