摘要： The underlined word "contact" in the last paragraph means to . A. keep in touch with B. turn to C. make a call to D. write to E 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 transfusionif the blood is too different from his own. There are four basic types of blood A. B. A B. and O. Blood type, like hair and height, comes from parents. Basically, A and B can not be mixed. 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. Patientsusually receive nothing, but salt or plasmauntil 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 % have type A while 45 % have type O. The fewest is the type B.

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