题目

某酸HX稀溶液和某碱YOH稀溶液的物质的量浓度相等，两溶液混合后，溶液的pH大于7，下表中判断合理的是(    ) 编号HXYOH溶液的体积关系①强酸强碱V(HX)=V(YOH)②强酸强碱V(HX)＜V(YOH)③强酸弱碱V(HX)=V(YOH)④弱酸强碱V(HX)=V(YOH)A.①③                B.②③                   C.①④                 D.②④He has been away _____. [     ]A. since a month B. for a monthC. for a month ago D. in a month