单项选择题
A.much B.very C.such D.so
A. Russians think smiling at strangers is a proper behavior. B. Russians usually smile as frequently as Americans do. C. Many Americans smile freely at strangers in public. D. Russians and Americans have the same opinion of smiles.
A. buyers used to doubt the quality of goods from unknown sellers B. team buying is a good Chinese tradition C. team buying is not accepted by people D. buyers never purchase goods from unknown sellers