第19题: [单项选择]{{B}}Questions 11 to 18 are based on the conversation you have just heard.{{/B}} A. A doctor. B. A police officer. C. A repairman. D. An actress. 参考答案:C 答案解析:[听力原文]
W: Hold it right there. Put your hands against the wall.
M: But I was just checking to be s
第23题: [单项选择]女性,35岁。二尖瓣狭窄,当失代偿期发生时,最初的症状是()。 A. 咯血 B. 腹痛 C. 晕厥 D. 心绞痛 E. 劳力性呼吸困难 参考答案:E 答案解析:二尖瓣狭窄最早出现的症状为夜间阵发性呼吸困难,严重时端坐呼吸;极重者可产生肺水肿,咳嗽,咳粉红色泡沫样痰。症状多于睡眠或活动后加重,可伴有咳痰,痰中带血,咯血,随着病情进展,出现下肢水肿、少尿时,呼吸