题目内容：
11. A good title for this passage is .A. Getting Blood and Plasma
B. Special Blood Types
C. Human Blood Types
D. The Blood Bank of a Hospital
12. The word "hence" in line 8 means .
A. always B. often C. therefore D. seldom
13. In a blood transfusion, it is easiest to find the acceptable type of blood for a person with the blood type of _________.
A. A B. B C. AB D. O
14.The purpose of using salt and plasma before a blood transfusion is to allow time
A. to test the reactions to the transfusion
B. for matching the blood to be transfused with the patient.s blood
C. for the blood to be delivered from the blood bank
D. to select a new type of blood for the patient
15. Most Europeans have blood type______.
A. A B. B C. O D. A or O
参考答案：