题目

Mr. and Mrs. Scot prefer a restaurant in a small town to _____ in so large a city as New York． A．that                  B．the one           C．one                     D．it 答案：C 每做一次焰色反应实验，都要用一种试剂洗净铂丝，这种试剂是 [　　] A． Na2CO3溶液 B． NaOH溶液 C． 硫酸 D． 盐酸