第24题: [单项选择]小儿上呼吸道感染最常见的病原体是:() A. 呼吸道合胞病毒 B. 肺炎链球菌 C. 肺炎支原体 D. 轮状病毒 E. 金黄色葡萄球菌 参考答案:A 答案解析:各种病毒和细菌均可引起急性上呼吸道感染,但90%以上为病毒,其中以呼吸道合胞病毒(A)、鼻病毒、流感病毒、副流感病毒、腺病毒、冠状病毒等常见。轮状病毒主要引起秋季腹泻,故不答D。由细菌引起的上感少见,故不答BCE。
第25题: [单项选择]The lecturer explained the Water Gate scandal vigorously ______ and every student was attracted by his detailed and vivid presentation. A. at length B. lengthily C. at last D. at all 参考答案:A 答案解析:题意为:讲演者神采飞扬地把水门事件细细道来,学生们都被他详尽生动的讲解吸引住了。
此题考查副词和副词词组的掌握。根据上下文,应该是“详尽地阐述”,所以选A。lengthily有消极含义,“冗长
第33题: [单项选择]The man learned ______ that there would be a concert last Friday. A. over the radio B. from one of his workmates C. from the newspaper D. from his friends 参考答案:C 答案解析:[解析] 第二句提到“The advertisement…the pa- per...”。