题目

In front of our house ______ we used to swim.     A. a river lies that                    B. does a river lie where         C. lies a river which               D. lies a river where 答案：D下列各组离子在溶液中能大量共存的是（ ）A.H+、SO42﹣、OH﹣B.H+、Cl﹣、CO32﹣C.Cu2+、Cl﹣、OH﹣D.Na+、NO3﹣、SO42﹣