第4题: [单项选择]直肠狭窄的产生是由于() A. 术后直肠粘膜发生大面积{感染 B. 术中未能保留皮桥 C. 肛管皮肤损伤过多 D. 皮肤对合不良 E. 以上均正确 参考答案:A
第5题: [单项选择]According to the passage, what is a relatively new focus in archaeology A. Studying prehistoric cultures. B. Investigating ancient sites in what is now the United States. C. Comparing the culture of North America to that of Europe. D. Studying the recent past. 参考答案:D 答案解析:细节推理题。文章第一段的第一句就指出…archaeology has long been an accepted tool for studying prehistorie cultures...