患者女性，13岁，因“无明显诱因出现右背部疼痛”来诊。查体：步态不稳，双下肢乏力，走路须人扶，无其他部位放射痛。既往史无特殊，无药物过敏史。查体：体温36.6℃，咽部充血，双侧扁桃体Ⅱ度大。血常规：白细胞32.5×109/L，血红蛋白52g/L，红细胞1.93×109/L，血小板31×109/L，外周血中见幼稚细胞。骨髓穿刺检查：急性淋巴细胞性白血病（ALL-L3型）。影像学检查：腹腔CT示胰、脾体积增大且密度减低，双肾体积增大。诊断：中枢神经系统白血病。
中枢神经系统白血病的化学治疗原则为（）
A.早期
B.全程
C.联合
D.充分
E.诱导
F.间歇
G.集中
H.阶段
参考答案：A, C, D, F, H
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| Mr White with his wife 1 now living at a small Italian hotel, 2 they had stayed in Italy for months on holiday. One night he went out for a walk 3 . It was late. The small street was dark and 4 . Suddenly he heard 5 behind him. He 6 his head and saw a middle-aged man with wild hair, who quickly walked 7 him. The man was nearly out of sight when Mr. White suddenly found that his watch 8 . He thought it was the 9 man who had taken his watch, so he ran quickly after him and soon caught up with him. As he knew 10 Italian, Mr. White had to ask the man 11 the watch in another way. He showed the man his strong arms and 12 to his watch pocket. The man thought a while and gave 13 watch to Mr. White. Mr. White returned home and told his wife 14 had happened. He was greatly surprised when Mrs. White pointed to the watch on the table. Now he found it was 15 that had taken the Italian's watch. | ||||
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