第21题: [单项选择]房室延搁一般发生于 A. 兴奋由窦房结传至心房肌时 B. 兴奋在心房肌内传导时 C. 兴奋在房室交界区传导时 D. 兴奋由房室束传至左右束支时 E. 兴奋由浦肯野纤维传至心室肌时 参考答案:C
第22题: [单项选择]A. The minutes of the last meeting. B. The treasurer’s report. C. The Scottish and Irish Folk Dances. D. The International Display Week. 参考答案:D 答案解析:[听力原文] What is at the top of the meeting’s agenda