题目

下列溶液导电能力最强的是（    ） A、0.2 mol/L硫酸    B、0.4 mol/L氨水    C、0.2 mol/L盐酸    D、0.2 mol/L醋酸 答案：A — I phoned you at 7 yesterday evening but nobody answered.    — Oh, I ________ my dog in the park then. A. walked          B. was walking                   C. had walked                    D. would walk