第9题: [单项选择]持续性枕后位的主要原因是() A. 中骨盆狭窄 B. 胎头俯屈不良 C. 胎儿相对过大 D. 子宫收缩过弱 E. 单纯扁平骨盆 参考答案:A 答案解析:单纯扁平骨盆为骨盆入口平面狭窄,胎头衔接受阻,不能入盆,故选项E错误;中骨盆狭窄,是持续性枕后位的主要原因,故选项A正确;胎头俯屈不良和子宫收缩过弱是持续性枕后位的次要原因,故选项B、D错误。
第28题: [单项选择]{{B}}Questions 11 to 18 are based on the conversation you have just heard.{{/B}} A. He should he polite to his boss. B. He should become a road builder. C. He should mend the building for the boss. D. He should ask the way. 参考答案:A 答案解析:[听力原文]
M: I was fired by the boss, because I was rude to him.
W: Don’t you think you should mend y