单选,2分] _______是为消费者提供商品或者服务的市场主体,其义务的履行是保障消费者权利的首要条件
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
— ___________________
— Once or twice a week.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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