2. 外语
  3. In the early part of the 20th century, physicians discovered that blood transfusions often failed because ______. The best titl

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

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问题 In the early part of the 20th century, physicians discovered that blood transfusions often failed because ______.
The best title for this passage would be ______.
选项 A、The Importance of Blood Type
B、The Importance of Blood Transfusion
C、Blood Type
D、Hereditary Blood-group Systems
答案C
解析 A、B项强调血型或输血的重要性，但据文章的意思来看，本文纯粹介绍血型的基本概念和重要性，所以应选C项。
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