There is another problem. To give blood of the right kind, doctors have to find a person of the right blood group. Often they can not find a person in time. If they have a way to keep the blood until someone needs it, they can always have the right kind of blood. At first they find they can keep it in bottles for fifteen to twenty days. They do this by making it very cold. Then they find how to keep it longer. In the end they find a way of keeping blood for a very long time.

　　We call a place where we keep money a "bank". We call a place where we keep blood a "blood bank". One day, when you grow up, you may decide to give blood to a "blood bank". In this way you may stop someone from dying. Or perhaps one day you may become ill. You may need blood. The "blood bank" will give it to you.

　　26. From the passage, we learn that sometimes people die when they have blood transfusions because they

　　.

　　A. are unhealthy people

　　B. have lost a lot of blood

　　C. are not given the right kind of blood

　　D. are AB-group people

　　27. Which of the following is true?

　　A. Doctors can give any kind of blood to the writer.

　　B. The writer can give blood to B-group people.

　　C. The writer has never had a blood transfusion.

　　D. The writer has the same kind of blood as his father.

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