题目

 He raised ______ for the charity to help the poor children.    A. thousand of dollars                          B. thousand of dollar    C. thousands of dollars                       D. thousands of dollar 答案:C用式量为43的烷基取代甲苯苯环上的一个氢原子,所得芳香烃产物的数目为(    )   A.3   B.4   C.5   D.6  
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