题目

I think I’m one of the luckiest people in the world because of the time I’m able to spend with young people who are not afraid to show their excitement and zest for life.   21   , I would prefer a person with passion and enthusiasm to a person with   22   and talent any day of the week. You can teach and develop skills,  23   you cannot develop a love of life and an optimistic attitude. These are  24   of a person and appear at all times during work or play. Furthermore, they are traits that one is born with and they will never  25    them. As a  26   and an I下图表示两细胞间发生某种信息传递的过程。细胞Ⅰ、Ⅱ 以及物质M、N的名称与图示含义相符的是（ ）①胰岛A细胞、肝细胞、胰高血糖素、肝糖原②浆细胞、肺结核杆菌、抗体、抗原③垂体细胞、甲状腺细胞、促甲状腺激素、受体④传出神经、传入神经、神经递质、受体A. ①③ B. ①④ C. ②③ D. ②④