第5题: [单项选择]According to the passage , before microbes were discovered it was believed that some diseases were caused by ______. A. germ-carrying insects B. certain strains of bacteria C. foul odors released from swamps D. slimy creatures living near swamps 参考答案:C 答案解析:细节题。文章第一段解释了直到19世纪细菌被发现之前,人们认为沼泽地里释放的有毒恶臭会引起多种疾病。
第31题: [单项选择]口腔健康调查目的描述哪项是不正确的()。 A. 查明口腔疾病在特定时间内的发生频率和分布特征及流行规律 B. 了解和分析影响口腔健康的有关因素 C. 为探索病因,建立和验证病因假说,并为指导和改进临床治疗提供依据 D. 选择预防保健措施和评价预防保健措施的效果 E. 估价治疗与人力需要 参考答案:C