直肠癌常发生在()
A．直肠
B．乙状结肠
C．骶骨
D．肛门
E．直肠和乙状结肠交界处
参考答案：E
(2013·辽宁高考)At no time ________ the rules of the game. It was unfair to punish them.
A．they actually broke
B．do they actually break
C．did they actually break
D．they had actually broken
能引起妇女月经过多综合征的毒物有
A．苯、汽油、二硫化碳B．铅、汞、三氯乙烯C．苯、三硝基甲苯、铅D．苯、汽油、汞E．铅、汞、砷
