You have been badly injured in a car accident．It is necessary to

You have been badly injured in a car accident．It is necessary to give you a blood transfusion because you lost a great deal of blood in the accident．However,special care must be taken in selecting new blood for you．If the blood is too different from your own,the transfusion could kill you. 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 A B．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、Getting Blood arid Plasma
B、Special Blood and Colors
C、Human Blood Types
D、The Blood Bank of a Hospital
【正确答案】：C
【题目解析】：该文章主要介绍了人类血型的分类、输血时的注意事项、血型与遗传的关系以及血型与民族之间的关系。首先，文章通过描述一个人因车祸受伤需要大量输血，进而引出对血型选择和输血重要性的讨论。接着，文章详细描述了四种基本血型（A、B、AB、O）的特点，包括它们之间的输血兼容性以及每种血型在输血中的角色（如O型血被称为“万能供血者”，AB型血被称为“万能受血者”）。最后，文章还提及了血型与民族的关系，不同民族有不同的血型分布比例。 现在我们来分析每个选项： A. Getting Blood and Plasma（获取血液和血浆）：这个选项只涉及到了输血过程中的一部分内容（即获取血液和血浆），而没有涵盖文章的主要内容——血型的分类和特性。 B. Special Blood and Colors（特殊血液和颜色）：这个选项与文章内容不符，文章并没有讨论“特殊血液”或“颜色”的问题。 C. Human Blood Types（人类血型）：这个选项准确地概括了文章的主要内容，即人类血型的分类、输血兼容性以及血型与遗传和民族的关系。 D. The Blood Bank of a Hospital（医院的血库）：虽然文章提到了医院血库在匹配血型时的作用，但这只是文章的一小部分，不足以概括整篇文章的内容。 综上所述，最合适的标题是C. Human Blood Types。