第7题: [单项选择]A candle used to burn at auction sales ______. A. because they took place at night B. as a signal for the crowd to gather C. to keep the auctioneer warm D. to limit the time when offers could be made 参考答案:D 答案解析:从文中第二段最后一句可知。
第22题: [单项选择]下列哪项心电图表现属于莫氏Ⅱ型房室传导阻滞的特征()。 A. PR间期逐渐延长,QRS波群脱落 B. PR间期固定,QRS波群有时脱落 C. RR间期逐渐缩短,直至一次长的间歇 D. 长RR间隔>2次短的RR间隔之和 E. 间歇后第一次RR间隔大于间歇前的RR间隔 参考答案:B