美国游客大卫和两个儿子来北京旅游,在首都机场礼品店(退税商店)购买了两把折扇和一个鼠标垫,带回家送人,这三件商品一共消费502元。则应退增值税为( )元。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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