第12题: [单项选择]急性心肌梗死合并心源性休克的主要机制是() A. 收缩期排血受阻 B. 舒张期充盈不足 C. 心排血量急剧下降 D. 血容量不足 E. 神经反射机制 参考答案:C 答案解析:心肌广泛坏死(40%以上),心排血量急剧下降为心源性休克的主要机制。
第13题: [单项选择]{{B}}Questions 11 to 18 are based on the conversation you have just heard.{{/B}} A. Tom is very responsible. B. Tom’s words aren’t reliable. C. What Tom said is true. D. Tom is not humorous at all. 参考答案:B 答案解析:[听力原文]
W: I thought Tom said he got A’s in all his tests.
M: Mary, you should know better than to