哪种疾病一般不会出现鲜血便（）
A.结肠癌
B.直肠息肉
C.胃溃疡
D.肛裂
E.痔疮
参考答案：C
It is only when an NBA player has been through many battles _______he learns an important lesson: there is no "I" in "team".
A．after
B．before
C．what
D．that
戒尺、棍棒作为中世纪的主要工具，是出于( )。
A．原罪说
B．缺乏纪律
C．不学无术
D．思想反动
