第3题: [单项选择]男性，28岁。一天前出现发热，恶心呕吐，腹泻7次，伴里急后重。便培养示志贺痢疾杆菌生长。其腹泻的发生机制是（） A. 肠黏膜的吸收面积减少或吸收障碍 B. 黏膜炎症、溃疡等致血浆、黏液、脓血渗出 C. 肠蠕动亢进致肠内食糜停留时间少 D. 胃肠黏膜分泌过多的液体 E. 肠内容物渗透压增高 参考答案:B 答案解析:志贺氏菌引起的感染，限于胃肠道，很少侵入血液。志贺菌附着在肠上皮细胞，破坏肠黏膜而造成溃疡，进而导致血浆、黏液、脓血渗出。
A. people are not as capable as they think B. lack of ability results in lack of determination C. lack of competence leads to failure D. people can be more capable than they think 参考答案:D 答案解析:[解析]事实细节题。文章最后一段提到“This experience made him realize that many people have more ability than they thi
