As we know, blood types A and B cannot receive AB, but AB may receive A or B. Type O can give to any other group; hence it is often called the _____ donor. ( 章节：5 难度：3)_做题室

单项选择题As we know, blood types A and B cannot receive AB, but AB may receive A or B. Type O can give to any other group; hence it is often called the _____ donor. ( 章节：5 难度：3): A、general; B、popular; C、universal; D、common

正确答案：C
答案解析：
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