More and more Chinese consumers are beginning to embrace a brand new retail experience. As a ____11____ of the advancement in artificial intelligence technology, consumers are now able to serve themselves without interacting ____12____ a cashier. For example, it is now possible to order a cup of espresso by ____13____ paying via facial recognition technology at cashier-less stores. Two grocery stores with unmanned checkouts have ____14____ a one-day trial in Beijing and Hangzhou, with the intention of testing the integrity of customers.A QR code (二维码) and guidance were placed in a cashier-free outlet ____15____ to the Vanguard supermarket chain in downtown Hangzhou. Customers ____16____ the job of the cashier by scanning bar codes themselves. They have been able to pay via mobile phone or put cash in an honesty box. The grocery store sold products ____17____ 16,700 yuan, roughly 2,700 US dollars, but only ____18____ payment to the amount of 13,700 yuan from customers. In the Beijing outlet under AMPM, a convenience store chain, the staff said some customers stole products or paid less.A Vanguard executive said cashier-free supermarkets ____19____ queuing time and are developing fast abroad. With an improved credit system, the Vanguard executive ____20____ more cashier-free grocery stores to open in China. The trial was jointly run by the two store chains and Sesame Credit, a credit scoring service introduced by a financial affiliate of e-commerce giant Alibaba.11.A. partB. consequenceC. matterD. form