第4题: [单项选择]6岁,男孩,胸骨左缘第3肋间闻及Ⅲ级喷射性杂音,肺动脉瓣第二音增强、固定分裂,并在胸骨左缘下部闻及Ⅱ级柔和舒张期杂音。心电图显示电轴右偏,右房、右室增大。应考虑下列哪一种可能性较大() A. 房间隔缺损合并三尖瓣狭窄 B. 室间隔缺损合并三尖瓣狭窄 C. 房间隔缺损较大,左向右分流量较多 D. 室间隔缺损较大,左向右分流量较多 E. 以上都不是 参考答案:C 答案解析:室间隔缺损和房间隔缺损分流量较大时,从左房进入左室或右房进入右室的血流量较多,从而可导致二尖瓣或三尖瓣相对性狭窄,此时在心尖部(即二尖瓣听诊区)或胸骨左缘下部(三尖瓣听诊区之一)闻及舒张期柔和短促的隆
第5题: [单项选择]On entering the laboratory, Mr Abu was immediately suspicious because ______. A. the whole class was looking so innocent B. he was a suspicious man by nature C. there was no teacher in the room D. he could smell chemicals and he knew it was a physics lesson 参考答案:A 答案解析:从最后一段内容可以知道,Mr.Abu一走进实验室,首先观察的是学生的表情,他们一脸无辜的样子引起了他的怀疑,然后他才闻空气的味道。
A. it minimizes quarrels B. it cuts down the number of drivers C. most drivers will hit you if offended D. most drivers never make acknowledgements 参考答案:A 答案解析:[解析] 推理判断题。保持驾车行路礼仪可以减轻开车的紧张和失落,使人们相互忍让,[A]项属于合理推断。行路礼仪与减少司机数量没有联系,[B]项不对。[C]项属于主观臆断。[D]项与题意不符。