题目

English is a language shared by several diverse cultures, each of      uses it somewhat differently.        A. which                             B. what                               C. them                       D. those 答案：A已知由C、H、O元素组成的化合物9.2 g，完全燃烧后可以得到17.6 g CO2和10.8 g H2O，则该化合物的化学式为(    ) A.C2H4                  B.C2H6                 C.C2H4O                 D.C2H6O