题目

What time is it now?A.7: 00. B.7: 40. C.8: 00. 答案：【答案】A【解析】【原文】W: I’m sorry I’m late. I left work at 5 and it took me two hours to get here. I waited forty minutes for a taxi.M: Well, never mind. The show doesn’t start until 7:30, so we’ve still got half an hour.洋洋买一种“龙骑士”战斗陀螺，经过还价后，付款6元钱，比原价便宜了4元钱．小龙买战斗陀螺实际价钱比原价便宜了百分之几？