题目

— Why did the dinner party start so late last night? — It was _____ that caused him to serve dinner an hour later than usual.  A. we were late   B. we being late          C. our being late    D. because we were late   答案：C 解析: 本题考查强调句的一般用法，强调部分在句中作主语，该句中主语由动名词的复合结构充当。化学与人类的生活的关系非常密切，下列说法你认为正确的是              (    ) A．燃烧法可以鉴别羊毛和蚕丝             B.钢铁腐蚀、汽油燃烧均属于缓慢氧化 C．黄曲霉素可用作抗生素                D．铵态氮肥和熟石灰不能混合使用