题目

— Why didn't you help the little boy? —Oh, he had struggled to his feet ______ I could run over and offered any help. A . before B . after C . when D . since 答案：A7．只列式不计算．5个5.4是多少？5.4×5      1.6的3.2倍是多少？1.6×3.28.6的一半是多少？8.6×0.5　    52的十分之三是多少？52×0.3．