第18题: [单项选择]镇痛药按其作用特点和机制可分为() A. 强镇痛药和解热镇痛药两大类 B. 弱镇痛药和解热镇痛药两大类 C. 不解热镇痛药和解热镇痛药两大类 D. 吗啡和阿司匹林两大类 E. 吗啡和保泰松两大类 参考答案:A 答案解析:镇痛药分类:按其作用特点和机制分为:强镇痛药和解热镇痛药两大类。
第27题: [单项选择]After several days' investigation, the police found out one clue that voices were heard ______for help from some very distant place that night. 参考答案:C 答案解析:非谓语动词题。该题考查的是非谓语动词作定语的情况。该句的同位语从句的主语是voices,谓语是 were heard,很显然call在句中为非谓语动词,因此可排除[D];call的逻辑主语是voice