鼻内镜手术扩大上颌窦自然孔时过度向前易损伤（）
A.眶纸样板
B.筛前动脉
C.视神经
D.鼻泪管
E.筛板
参考答案：D
— Why is the classroom so dirty?
— Sorry, sir. It yesterday. We forgot to do it. [ ]
A．doesn't clean
B．didn't clean
C．isn't cleaned
D．wasn't cleaned
患者女，54岁。查体肠鸣音10次/分，高亢，响亮，呈金属音，该患者可能是（）.
A.机械性肠梗阻
B.低血钾
C.腹膜炎
D.老年性便秘
E.麻痹性肠梗阻
