[单项选择]男性,71岁。患慢性支气管炎和阻塞性肺气肿近10年,曾因呼吸衰竭抢救2次。目前动则气急,不吸氧时动脉血气分析PaO6.7kPa(50mmHg),PaCO6.7kPa(50mmHg)。正在医生指导下接受呼吸康复治疗。为锻炼呼吸肌力和耐力,此例患者可以选择() A. 吸气阻力锻炼 B. 双水平气道正压呼吸支持 C. 间歇正压呼吸支持 D. 呼气末正压呼吸支持 E. 体外负压呼吸支持
第30题: [单项选择]I had to work extremely carefully, for I didn’t know how long ______ to get used to the new tool. A. it would take me B. it would spend me C. would it pay me D. would it cost me 参考答案:A 答案解析:[解析] 本题考查It takes sb. some time to do sth.的句型和陈述语序。