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    Karl Landsteiner first thought of naming blood types in 1900. He put blood into four types. These four blood types were named A, B, AB, and O. Blood type O is the most common around the world. Blood type A is the second most common. and type AB is the least common.
    Doctors try to give blood to a person according to the person’s blood type. Blood type O can be given to a person with any other blood type, but doctors also need to make sure that the “RH factor (因子)” in patients’ blood matches the blood they are given. If people have one kind of protein (蛋白质)in their blood, they are RH positive (Rh+). If people do not have the protein, they are Rh negative (Rh-). Most people are Rh+.
    If a mother has an Rh- blood type, she may have trouble when she has a baby. If her baby is Rh+, the baby’s blood may mix with the mother’s blood before the baby is born. The mother’s blood will change. If the mother has another Rh+ baby, the mother’s blood will attack the baby’s blood. The baby may die or become sick. Doctors have to watch the mother and baby carefully in these cases.
    小题1:Who named the blood type?
    A．Albert Einstein.B．Thomas Edison.
    C．Albert Schweitzer.D．Karl Landsteiner.
    小题2:Which blood type is the second most common in the world?
    A. Blood type A.    B. Blood type B.      
    C. Blood type AB.   D. Blood type O .
    小题3:What must be in a person’s blood if the person is Rh+?
    A．Special water.B．A special protein. C．Baby’s blood.D．Electricity.
    小题4:Which of the following might be dangerous for the baby?
    A．Mother (Rh+) / baby (Rh+).B．Mother (Rh+) / baby (Rh-).
    C．Mother (Rh-) / baby (Rh+).D．Mother (Rh+) / baby (Rh-).
    小题5:Where is this article most probably taken from?
    A．A story book.B．A news report.C．A science magazine.D．An ad

    小题1:D
    小题2:A
    小题3:B
    小题4:C
    小题5:C

    试题分析：短文大意：卡尔泰纳在1900年把血液分为四种类型。这四种血型被命名为A，B，AB和O型。O型血是最常见的，AB型是最不常见的。
    小题1:细节理解题。根据第一段第一句Karl Landsteiner first thought of naming blood types in 1900.可知该选D。
    小题2:细节理解题。根据第一段第五句Blood type A is the second most common.可知该选A。
    小题3:细节理解题。根据第二段中If people have one kind of protein (蛋白质)in their blood, they are RH positive (Rh+).可知该选B。
    小题4:细节理解题。根据第三段可知该选C。
    小题5:细节理解题。本文是介绍科普知识的，所以最有可能出现在科学杂志上，所以选C。
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    Where does Tracy study ?
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