Question

一到英语阅读题，就一道，急求……

Many hospitals have blood banks．In these banks, blood of all types is stored．When blood is needed, it is taken from the bank．Healthy people then give blood to the bank to replace (取代) the blood that is used．Blood can be kept in the fridge for about three weeks with a kind of chemical．
　　When people lose much of their blood because of operation or accident, they may need transfusions (输血)．Some people may need transfusions because of illness．Sometimes only a part of the blood is used for transfusions．Plasma (血浆), the liquid part of the blood, may be given alone．Transfusions of plasma are often given when people have been badly burned．
　　When a person gets a transfusion, he gets blood of the same type as his．Or there maybe a bad reaction (反应)．To make it safer, before a transfusion is given, the blood to be used must be tested with the blood of the person who is to receive it．This testing is called cross matching of the blood．
　　Oswald Robertson, an American doctor, was the first one to give transfusions．He used blood that had been stored for some time to help wounded soldiers in 1918 in World War I．
问题：why should a person get blood of the same type as his when gets a transfusion

Answer 1

Because there will be a bad reaction if a person doesn't get blood of the same type as his when gets a transfusion.

答案在这儿：【…………】
Many hospitals have blood banks．In these banks, blood of all types is stored．When blood is needed, it is taken from the bank．Healthy people then give blood to the bank to replace (取代) the blood that is used．Blood can be kept in the fridge for about three weeks with a kind of chemical．
When people lose much of their blood because of operation or accident, they may need transfusions (输血)．Some people may need transfusions because of illness．Sometimes only a part of the blood is used for transfusions．Plasma (血浆), the liquid part of the blood, may be given alone．Transfusions of plasma are often given when people have been badly burned．
When a person gets a transfusion, he gets blood of the same type as his．【Or there maybe a bad reaction (反应).】To make it safer, before a transfusion is given, the blood to be used must be tested with the blood of the person who is to receive it．This testing is called cross matching of the blood．
Oswald Robertson, an American doctor, was the first one to give transfusions．He used blood that had been stored for some time to help wounded soldiers in 1918 in World War I．

Answer 2

When a person gets a transfusion, he gets blood of the same type as his．Or there maybe a bad reaction (反应)．
当一个人进行输血时，他需要输与他的血型一样的血，否则可能产生坏的效果。

Answer 3

从原文Or there maybe a bad reaction (反应)．这一句中可以知道，答案应该是：
Becourse if a person get blood of the different type as his ，there may be a bad reaction。

Answer 4

答案在第三段。。。because there maybe a bad reaction 不同的血型之间会有不好的反映（排斥）

Answer 5

as there maybe a bad reaction (反应)．