第11题: [单项选择]肺动脉闭锁合并室间隔缺损时,其中肺动脉闭锁中不包括() A. 肺动脉瓣闭锁 B. 周围肺小动脉闭锁 C. 主肺动脉及其分叉闭锁 D. 主肺动脉闭锁 E. 主肺动脉和左右肺动脉分支闭锁 参考答案:B 答案解析:肺动脉闭锁是指主肺动脉、肺动脉瓣及肺动脉左右分叉部这三者中的一处或几处发生闭锁,根据有无室间隔缺损分为两型。
第25题: [单项选择]His mother had talked to him for many minutes while he was watching TV, but ______. A. a little did he hear B. 1ittle did he hear C. 1ittle heard he D. a little heard he 参考答案:B 答案解析:具有否定意义的副词如:little,seldom,never,hardly,scarcely, rarely等位于句首时,句子的主谓部分倒装。