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单选题
There are four basic types of blood; A, B, AB and O．A simple test can indicate a person's blood type．Everybody is born with one of these four types of blood．Blood type, like hair color and height, is inherited from parents.
Because of substances contained in each type, the four groups must be trans fused carefully．Basically, A and B cannot be mixed．A and B cannot receive AB, but AB may receive A or B．O can give to any other group, hence it is often called the universal donor．For the opposite reason, AB sometimes called the universal recipient．However, because so many reactions can occur in transfusions, patients usually receive only salt or plasma until their blood can be matched as exactly as possible in the blood bank of a hospital．In this way, it is possible to avoid any bad reactions to the transfusion.
There is a relationship between your blood type and your nationality．Among Europeans and people of European ancestry, about 42 percent have type A while 45 percent have type O．The rarest is type AB．Other races have different percentages．For example, some American Indian groups have nearly 100 percent type O.
A good title for this passage is __.
A
B
C
D
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答案：
解析：
本文讲述了人的血型及其相关的输血注意事项，包括血型遗传、不同血型之间的输血规则以及血型与国籍之间的关系等。因此，一个合适的标题应该是关于人类血型的，选项C“Human Blood Types”最符合文章内容。
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