A. Taking picture. B. Visiting friends. C. Buying some presents for his family. D. All of the above. 参考答案:D 答案解析:[听力原文] I had spent my last day in London visiting friends, taking pictures and doing some las
第34题: [单项选择]国内咯血的最常见的临床病因是______ A. 支气管扩张 B. 肺结核 C. 慢性支气管炎 D. 支气管肺癌 E. 风湿性心脏病二尖瓣狭窄 参考答案:A 答案解析:引起咯血的原因很多,以呼吸系统和心血管疾病为常见。呼吸系统疾病主要为支气管和肺部疾病,常见的有支气管扩张症、支气管肺癌、支气管结核和慢性支气管炎、肺结核、肺炎、肺脓肿等。心血管疾病较常见的是二尖瓣狭窄