[单项选择] Questions 14-17 are based on the following dialogue between classmates about their presentation. You now have 20 seconds to read Questions 14-17.What is the woman’s tone of voice when she first sees the man A. Relieved. B. Sarcastic. C. Sad. D. Apologetic.
参考答案:A 答案解析:[听力原文]14-17 Woman: Jim, thank goodness you arrived, the class presentation started half of an hou
第12题: [单项选择]关于左冠状动脉的描述,下列哪项是正确的 A. 起于主动脉弓 B. 分为前室间支和旋支 C. 分为前室间支和后室间支 D. 分支分布于室间隔的后1/3 E. 旋支分布于右心室侧壁 参考答案:B 答案解析:左冠状动脉起始于升主动脉,向左行于左心耳与肺动脉干之间,至冠状沟分为前室间支和旋支。前室间支沿前室间沟下行,分支分布于左心室前壁、右心室前壁的一部分和室间隔的前2/3部;旋支沿冠状沟至膈面,途中分支分