2. 职称英语
  3. In the early part of the 20th century, physicians discovered that blood transfus

In the early part of the 20th century, physicians discovered that blood transfus

游客2023-09-23  12
问题 In the early part of the 20th century, physicians discovered that blood transfusions often failed because ______. [br] If a patient whose blood type is O needs blood transfusion, who can be the donor?
选项 A、Blood typea.
B、Blood typeb.
C、Blood type AB.
D、Blood type O.
答案 D
解析 文章讲到O型血的人是universal donors，但不是universal recipients。因为在第二段最后一句“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 recipents, respectively.”中respectively是“各自地，独立地”的意思。同时另一句“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.”其句意是：O型血的人红细胞中没有该物质，但个体的人能形成抗A或B型红细胞的抗体。所以，只有O型血的人能给O型人输血。
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