A. Because he signed an agreement with North Viet Nam. B. Because many administration officials resigned. C. Because he may encounter the impeachment due to the scandal. D. Because Vice President Spiro Agnew resigned. 参考答案:C 答案解析:[解析]推理判断题。从文章第四至六段可知,尼克松下台的主要原因是“水门事件”。第四段最后一句指出:尽管尼克松否认与“水门事件”有关,但法官迫使他交出了录音带,证明尼克松确实妨碍了司法调查。由此可知,他
第20题: [单项选择]禽流感时流鼻液() A. 卡他性炎 B. 蜂窝织炎 C. 纤维素性炎 D. 多发性小脓肿 E. 肉芽肿性炎 参考答案:A