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The four blood types are【C1】______as A, B, AB, and O. Blood type A【C2】______red blood cells that have a substance A on their sur
The four blood types are【C1】______as A, B, AB, and O. Blood type A【C2】______red blood cells that have a substance A on their sur
admin
2010-04-12
14
问题
The four blood types are【C1】______as A, B, AB, and O. Blood type A【C2】______red blood cells that have a substance A on their surface. This type of blood also contains an antibody directed【C3】______substance B, found on the red cells of persons with blood type【C4】______. Type B blood contains the【C5】______combination. Blood type AB contains【C6】______antibody, but red cells in this type of blood contain both A and B substances. In type O blood, neither substance is【C7】______on the red cells, but the individual is【C8】______of forming antibodies directed against red cells containing substance A or B. If blood type A is transfused【C9】______a person with B type blood, anti-A antibodies in the recipient will【C10】______the transfused A red cells. Because O type blood has【C11】______substance on its red cells, it can be given successfully【C12】______almost any person. Persons with blood type AB have no antibodies and can receive【C13】______of the four types of blood; thus blood types O and AB are called universal donors and universal recipients,【C14】______.
【C15】______hereditary blood-group systems have【C16】______been discovered. The hereditary blood constituent called Rh factor is of great【C17】______in blood transfusions because it creates reactions that can threaten the life of newborn【C18】______. More than twenty【C19】______blood types have been discovered. Their primary importance is in【C20】______cases involving proof of father-and-child relationship.
【C1】
选项
A、called
B、named
C、known
D、recognized
答案
C
解析
call 与 name后一般不接as;而recognize在这里意思不对,应是为人所知的意思。
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0
大学英语四级
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