题目

完形填空。Life is not easy, so I’d like to say “When anything happens, believe in yourself.”When I was a young boy, I was _1_shy to talk to anyone. My classmates often _2_me. I was sad but could do nothing, Later,_3_happened,and it changed my life. It was an English speech contest. My mother asked me to _4_it .What a terrible idea! It meant I had to speak before all the teachers and students of my school.  “Come on, boy. Believe in yourself. You are sure to _5_the contest.” Then mother and I talked about many different topics. At last I chose the topic “Believe in yourself.人的体细胞中染色体数目为 (   )A．24对B．23对C．22对D．23条