头皮裂伤清创的最佳时限，最迟应在
A．72小时内B．24小时内C．8小时内D．12小时内E．48小时内
参考答案：B
My favorite teacher is Miss Lin, although she has _________ experience.
A．little
B．less
C．least
D．fewest
目前最常引起输血后肝炎的是（）
A.HAV
B.HBV
C.HCV
D.HDV
E.HEV
