题目

--Why don’t you get used to the life in Beijing? -- ______ the crowded traffic ______ the high living cost. The only reason is the badly polluted air. A. Either…or  B. Neither, nor    C. Not only, but also  D. Both, and 答案：B  某种解热镇痛药的结构简式如右图所示，当它完全水解时，可得到的产物有A. 2种    B. 3种     C. 4种     D. 5种