患者男性，59岁，因“突发眩晕伴恶心、呕吐3小时”就诊，晨起后突然感到眩晕和身体不稳，伴恶心、呕吐，平躺休息后1分钟左右可自行缓解，翻身时再次引起眩晕发作，无耳鸣耳聋。查体：意识清，精神差，头位变化时可诱发头晕，伴水平眼震，无听力障碍，余脑神经检查未见明显阳性体征，四肢肌力5级，双侧指鼻试验阴性，跟膝胫试验阴性，病理反射未引出。颅脑MRI未见异常。
其最主要的病因是（）
A.椎-基底动脉供血不足
B.脱落的耳石颗粒进入半规管
C.上半规管弓上隆起存在骨裂
D.内淋巴水肿
E.经血液循环或邻近组织感染内耳
参考答案：B
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| My name is Jane. My job is to write stories and newsletters for a magazine. I love traveling and hope to visit Great Britain one day. I'd like a pen pal from London, who is interested in discussing the differences between Europe and Asia. I love listening to pop music and playing football. I am Manuel. I'm a businessman and have a large company with many workers and clerks. I would like to find a pen pal who is also a businessman and lives in North America. I like using the Internet. I am working in a university. I speak English, French and Russian. My family name is Jackson but my students usually call me Sarah. I'd like a pen pal who is interested in language learning working in Oxford University. I don't like using computers for learning and I believe that true language learning can only happen in a classroom. I am Peter and interested in the differences between East Europe and North America. I love riding my horse Jackie and listening to jazz. I usually get up at 7 o'clock and go to school around 7:30 in the morning. I want to find a pen pal who has the same interest as me living in Sydney. Cindy is my first name. I am working in a travel agency. Sometimes I am called Mr Guide as I am working. I'd like to find a pen pal who comes from Europe. I like playing the piano and listening to jazz. I am interested in history, but I don't like discussing languages. | ||||||||||||||||||||||||
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