A. The man is learning how to use a computer. B. The woman is showing the man how to put page numbers on a document. C. The man is printing a document. D. The man is using his computer to do mathematical functions. 参考答案:B 答案解析:[听力原文]1-3 W: What's the problem M: I can't figure out how to put the page numbers on. I've do
第17题: [单项选择]患儿,3岁。钡灌肠发现直肠局限性狭窄,近端肠管明显扩张。诊断应考虑为() A. 先天性肛门闭锁 B. 急性肠套叠 C. 乙状结肠扭转 D. 直肠癌 E. 先天性巨结肠 F. 空、回肠转位 参考答案:E 答案解析:先天性肛门闭锁生后即出现症状,急性肠套叠不会发生直肠部狭窄。儿童罕见直肠癌。乙状结肠扭转钡灌肠可见钡剂通过受阻,可见鸟嘴状梗阻端。先天性巨结肠的基本病理变化是在肠壁肌间和黏膜下的神经丛内缺乏神经节细胞