2. 外语
  3. 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 oft

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 oft

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问题 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 ______ do- nor.
选项 A、common
B、universal
C、general
D、popular
答案B
解析 universal donor万能献血者；universal普遍的，一般的；common常见的，平常的；general普通的，一般的；popular流行的，受欢迎的。
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