题目

A few years after Mom died, Dad showed up for lunch wearing the soft smile that took over his face whenever he was thinking about her. “I’ve found these,” he said, handing me a bag. “She would have wanted you to have them.”I opened the bag to find dozens of shells, each one bearing Mom’s handwritten words: Stone Harbor, N. J. — 8-98. They were pretty common, but to Mom, they were evidence of her endlessly magical life.She was 61 when she collected these shells, already showing signs of the lung disease that would kill her the next year. Mom needed an adventure. She loved seashore6．除去下列物质中杂质（括号中为杂质），所用试剂错误的是（　　）选项ABCD物质CO2（CO）Fe（Cu）Cu（CuO）NaCl（MnO2）除杂试剂CuOCuSO4溶液COH2OA．AB．BC．CD．D