No kidding? 不是讲笑？

　　A: I can finish two large pizzas in 10 minutes all by myself. 　　A: 我可以一个人十分钟内吃下二个大pizzas。 　　B: No kidding? 　　B: 不是讲笑呀? 　　这里的”No kidding?”也可说成”Are you serious?”、”Really?”、”Are you...