在分次放疗中，总的治疗时间对疗效的影响主要是因为（）。
A.细胞再氧合
B.细胞周期再分布
C.细胞亚致死性损伤再修复
D.细胞再增殖
E.以上都不对
参考答案：D
解析：在常规分割放疗期间，大部分早反应组织有一定程度的加速再增殖。人肿瘤干细胞的再增殖在开始治疗后4周左右开始加速。每天需要增加0.6Gy以补偿加速再增殖所损失的效益。
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| Guo Hua was late for class. When he came to the classroom. Mr. Li was teaching. "May I come in, Mr. Li?" asked Guo Hua. "What's wrong with you?" asked the teacher, "Why are you late?" "Oh, I had an 1 this morning," answered Guo Hua in a low voice. "Were you badly hurt?" asked the teacher again, "Did you go to the hospital to see the doctor." "Thank you, Mr. Li," said Guo Hua, "Luckily, I was not badly hurt." "Could you tell us about your story?" said the teacher. "I got up early this morning. I came to school by bike. When I was on my way 2 school, I saw a new car near me. I like cars very much, as you know. I rode my bike very fast. The car and I were neck 3 neck. The driver looked at me. And she drove the car faster. Then she stopped the car in front of 4 . She wanted to open the door and get out of the car. I 5 the door of the car. That's all, " said Guo Hua slowly. "Do you remember the number of the car?" asked the teacher. "No. When I came to myself, the car was 6 . But I remember the driver," answered Guo Hua. "The driver is a girl. She has long hair. She is 7 a red dress. Her boots are brown. And she has a beautiful face." 8 the students 9 and the teacher said 10 . It's five o'clock in the afternoon. Everything is ready. How the first girl is. | ||||
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