【单选题】Christina wasn’t saying anything, but the professor smiled at her _______she had done something very clever.
【单选题】—She’s already back to Nantong, ______? —______. She is on a visit to Tokyo.
【简答题】She smiled back at the______faces of her students, (cheer)
【单选题】社会再生产过程中的生产、分配、()、消费四个环节都需要通过运输来连接。在一定意义上说,货物运输是社会经济发展的一个重要因素。