2. 外语
  3. In the early part of the 20th century, physicians discovered that blood transfusions often failed because ______. A baby’s bloo

In the early part of the 20th century, physicians discovered that blood transfusions often failed because ______. A baby’s bloo

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问题 In the early part of the 20th century, physicians discovered that blood transfusions often failed because ______.
A baby’s blood type is decided by ______.
选项 A、his father or his mother
B、his mother and his father
C、his grandparents
D、himself
答案B
解析 此题可根据常识来做，孩子的血型由父母决定。
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