患者，女，21岁，16岁时开始乏力、头晕，月经量过多，曾服用中药及铁剂，症状无改善。体检：皮肤黏膜苍白，肝肋下2cm，脾肋下2.5cm，余无异常。化验：Hb80g/L，RBC3.3×109/L，Hct0.26，网织红细胞0.027，染色血片中可见靶形红细胞，嗜多色性红细胞及有核细红细胞，肝功能正常，血清胆红素正常，骨髓增生明显活跃，幼红细胞增生显著，以中晚幼红细胞为主，G/E=0.9：1，未见巨幼样变，细胞外铁（+++），铁粒幼红细胞0.60，此病人最可能的诊断是（）
A.缺铁性贫血
B.地中海贫血
C.再生障碍性贫血
D.失血后贫血
E.巨幼红细胞贫血
参考答案：B
We lived in a very quiet neighborhood. One evening I heard a loud crash in the street. 36 that evening my wife had asked me to go to the store to get some soft drinks. It seemed like this would be a good time to let my teenage daughter Holly 37 her driving, so I sent her to the store in my truck. At dinner my son talked about how much he liked my 38 . I enjoyed having it, but I said: “Guy, my heart is not set on that truck. I like it but it is just metal and won’t last forever. Never set your heart on anything that won’t last. After hearing the loud noise, the whole family ran outside. My son shouted: “ Dad! Dad, Holly crashed your truck.” My heart sank and my mind was 39 with conflicting thoughts. Was anyone hurt? Who else was involved? As I ran to the door, I heard a voice in my heart say: “Here is a chance to show Holly 40 you really love. She’ll never forget it.” The accident had occurred in my own driveway. Holly had crashed my truck into our other vehicle, the family van (搬运车). In her inexperience, she had 41 _the brakes and the gas pedal. Holly was unhurt 42 but when I reached her, she was crying and saying：“Oh, Dad, I’m sorry. I know how much you love this truck.” I held her in my arms as she cried. Later that week a friend stopped by and asked what had happened to my truck. I told her the whole story. Her eyes moistened(湿润) and she said: “That happened to me when I was a girl. I borrowed my dad’s car and 43 a log that had fallen across the road. I ruined the car. When I got home my Dad knocked me to the ground and began to kick me.” Over 40 years later, she still felt the pain of the night. It was a deep wound on her 44 . I remember how sad Holly was the night she crashed our truck, and how I comforted her. One day, when Holly 45 on her life, I want her to know that I love her a thousand times more than any piece of 46 . I repaired the van, but the dent(凹陷) in my truck is still there today. Every day it reminds me of what really 47 in my life.
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，正电荷
，正电荷
，负电荷
，负电荷