被称为“万能输血者”的血型是（ ）
A．A型
B．B型
C．O型
D．AB型
由分析可知，输血以输同型血为原则．但在紧急情况下，AB血型的人可以接受任何血型，O型血可以输给任何血型的人． 如果异血型者之间输血输得太快太多，输进来的凝集素来不及稀释，也可能引起凝集反应．因此，输血时应该以输入同型血为原则．异血型者之间输血，要少而慢，只有在紧急情况下，不得已才采用．所以被称为“万能输血者”的血型是O型．
故选：C．
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| Twice-crowned beauty queen Michele Reis is 18 years old. But she is still mummy's little girl. Mrs. Reis described her 1 feeling the night her daughter 2 the Miss Hong Kong Beauty Pageant, "I felt 3 I suffered the loss of something important when they crowned her, not because I was not happy for her, 4 because I knew my daughter no longer belonged to me alone and I would have to share her 5 everyone else." But Mom should have seen it coming. With her Portuguese-Chinese heritage（血统）,Michele was quite 6 as a youngster. She 7 modeling part time as a school girl. There was something 8 about her even as a child. People in the street always turned around to 9 her. 10 her recent fame, the beauty queen said, "Sometimes I have the feeling that I am no longer myself now. My schedule is 11 . I'm not getting enough 12 , and I am always 13 from one place to another. There are times when I am 14 tired that I just want to sit and sleep." Being a celebrity has another 15 . "People no longer regard me as an 16 person. It's becoming more 17 for me to make friends, and I've learned to 18 old friends because they 19 treat me as Michele 20 Miss Hong Kong." | ||||
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