2. 外语
  3. In the early part of the 20th century, physicians discovered that blood transfusions often failed because ______. If a patient

In the early part of the 20th century, physicians discovered that blood transfusions often failed because ______. If a patient

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问题 In the early part of the 20th century, physicians discovered that blood transfusions often failed because ______.
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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