【答案解析】[听力原文] 83-85 Attention, shoppers. We are pleased to announce the start of our one-hour sale. From 5 p.m. until 6 p.m., all items in the store are fifty percent off. Remember, you need a Super Customer card in order to take part in this special sale. This card takes just a minute to sign up for and is totally free. If you don't have a Super Customer card, please see a sales clerk now, so that you can enjoy the deals during our one-hour sale. Everything in the store is fifty percent off for this hour only, everything from appliances to clothing. Happy shopping!
单选题
What discount is offered in this special sale?