2. 外语
  3. In medicine, blood type is the classification of red blood cells by the presence of specific substances on their surface. In the

In medicine, blood type is the classification of red blood cells by the presence of specific substances on their surface. In the

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问题    In medicine, blood type is the classification of red blood cells by the presence of specific substances on their surface. In the early part of the 20th century, physicians discovered that blood transfusions often failed because the blood type of the recipient was not compatible with that of the donor. In 1901 the Austrian doctor Karl Landsteiner classified blood types and discovered that the hereditary blood factor is of great importance in blood transfusions because it creates reactions that can threaten the life of newborn infants.
   The four blood types are known as A, B, AB, and O. Blood type A contains red blood cells that have a substance A on their surface. This type of blood also contains an antibody directed against substance B, which can be found on the red cells of persons with blood type B. Type B blood contains the opposite things. Blood type AB contains neither antibody, but red cells in this type of blood contain both A and B substances. In type O blood, neither substance is present on the red cells, but the individual is capable of forming antibodies directed against red cells containing substance A or B, If blood type A is transfused into a person with B type blood, anti-A antibodies in the recipient will destroy the transfused A red cells. Because O type blood has neither substance on its red cells, it can be given successfully to almost any person. Persons with blood type AB have no antibodies and can receive any of the four types of blood; thus blood types O and AB are called universal donors and universal recipients, respectively.
   Other hereditary(遗传的) blood-group systems have subsequently been discovered, for example, the Rh blood factor. And nowadays more than twenty additional blood types have been discovered. Their importance is obvious.
选项 A、the blood type of the donor was not compatible with that of the recipient
B、the blood type of the recipient was not suitable for that of the donor
C、blood type A contains red blood cells that have a substance A on their surface
D、blood cells are necessary for blood transfusion
答案B
解析 根据文章第一段第二句话来做，注意be compatible with “与……兼容”；be suitable for“适合……”。
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