千问：免单卡可以买年货，有效期还有19天

Group 1 - The core idea of the news is that the Qianwen App is promoting a "Spring Festival 3 billion big free order" campaign, allowing users to purchase various goods for the holiday season through a single platform [1] - The campaign, which started on February 6, has been extended until February 28, providing users with a one-stop shopping experience for New Year goods [1] - Users can buy products from major retailers such as Hema and Tmall Supermarket, as well as various chain supermarkets and convenience stores, including beverages, snacks, grains, and fresh fruits [1]