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问题 单项选择题 A1/A2型题

声波直接经颅骨途径使外淋巴发生相应波动，并激动耳蜗的螺旋器产生听觉，称为（）。

A.空气传导

B.骨传导

C.移动式骨传导

D.压缩式骨传导

E.以上均不对

答案

参考答案：B

解析：声波直接经颅骨途径使外淋巴发生相应波动，并激动耳蜗的螺旋器产生听觉，即骨传导。声波从颅骨传到耳蜗时其主要作用是使耳蜗壁发生振动，而耳蜗壁振动又通过移动式骨传导和压缩式骨传导两种方式引起内耳感受器兴奋。当频率低于800Hz的声波振动颅骨时，移动式骨传导起主要作用；当频率高于800Hz的声波振动颅骨时，压缩式骨传导起主要作用。

单项选择题

患者男性.47岁。上腹部间歇痛3年，受凉后易发作，近1周劳累后疼痛加重，突然呕血400ml。10年前曾患甲型肝炎，无乙型肝炎病史。查体：上腹部轻压痛，肝、脾无肿大。该患者最可能的诊断是（）

A.食管静脉曲张破裂出血

B.急性糜烂性胃炎

C.胃溃疡出血

D.贲门黏膜撕裂出血

E.胃癌出血
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单项选择题

All her life, my mother wanted busy children. It was very important that her house should remain at all times clean and tidy.
You could turn your back for a moment in my mother’s house, leave a half written letter on the dining table, a magazine open on the chair, and turn around to find that my mother had "put it back where it belonged," as she explained. My wife, on one of her first visits to my mother’s house, placed a packet of biscuits on an end table and went to the kitchen to fetch a drink. When she returned, she found the packet had been removed. Confused, she set down her drink and went back to the kitchen for more biscuits, only to return to find that her drink had disappeared. Up to then she had guessed that everyone in my family held onto their drinks so as not to make water rings on the end tables. Now she knows better.
These disappearances had a confusing effect on our family. We were all inclined to forgetfulness, and it was common for one of us, upon returning from the bathroom, to find the every sign of his work in progress had disappeared suddenly. "Do you remember what I was doing" was a question frequently asked, but rarely answered.
Now my sister has developed a secondhand love of clean windows, and my brother does the cleaning in his house, perhaps to avoid having to be the one to lift his feet. I try not to think about it too much, but I have at this later time started to dust the furniture once a week.

The underlined part in the fourth paragraph suggests that my sister ______.

A．is happy to clean windows
B．loves to clean used windows
C．is fond of cleaning used windows
D．likes to clean windows as my mother did
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