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Do you know blood types?
Special care must be taken in selecting new blood for a badly injured person, who would be killed by the transfusion if the blood is too different from his own.
There are four basic types of blood: A, B, AB, and O. Blood type, like hair and height, comes from parents. Basically, A and B cannot be mixed. A or B cannot receive AB, but AB, sometimes called the universal recipient, may receive A or B O type, often called the universal donor, gives his blood to any other group. Patients usually receive nothing but salt or plasma(血浆) until their blood can be matched as exactly as possible in the blood bank of a hospital. There is a relationship between your blood type and your nationality. Among Europeans, about 42 percent have type A while 45 per cent have type O. The fewest, is the type AB.
1．Which of the following shows the correct relationship in blood transfusion?
(“←” means giving blood to)
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2．From this passage we can know that among Europeans ________ 13 percent have type B.
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3．The title of this passage should be ________.
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A．Importance of Blood Transfusion
B．Choice of Blood Transfusion
C．Different Types of Blood
D．Human Blood Types
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