[单项选择]慢性支气管炎病情加剧的重要因素是() A. 大气污染 B. 粉尘刺激 C. 吸烟 D. 反复感染 E. 过敏
参考答案:D 答案解析:病毒、细菌和支原体感染是慢性支气管炎发生及加重的重要因素之一。
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第2题: [单项选择]Like most foreigners, I ask a lot of questions, some of which are insultingly silly. But everyone I ______ has answered those questions with patience and honesty. A. come across B. come by C. come over D. come into 参考答案:A 答案解析:come across不期而遇;come by经过;come over过来:come into进入。