引起黄疸的壶腹周围癌可来自于（）。①胰管末端上皮②胆管末端上皮③十二指肠 * * 部
A.①
B.②
C.③
D.①②③
参考答案：D
---Tom has been fired by his boss．
--- ? As far as I know, he is a hardworking and considerate fellow．
A．Why not
B．How come
C．What then
D．So what
G－菌由溶菌酶处理后所得到的缺壁细胞是（）
A、支原体
B、L型细菌
C、原生质体
D、原生质球
