第36题: [单项选择]呕血呈暗红色，是由于（）。 A. 在胃中停留时间长，被氧化 B. 是静脉血，非动脉血 C. 血红蛋白与胃酸结合而变性 D. 病人在缺氧情况下发生呕血 E. 血红蛋白与硫化物结合而变性 参考答案:C
第37题: [单项选择]{{B}}Questions 11 to 18 are based on the conversation you have just heard.{{/B}} A. He feels it was unfair. B. He thinks that he could have done better. C. He thinks it was very successful. D. He didn’t answer all of the questions. 参考答案:B 答案解析:[听力原文]
W: How did your interview go
M: I couldn’t feel better about it. The questions were very f
