单项选择题
A. Online shopping. B. Going from one place to another. C. Traveling between two places. D. Persons or companies that pass messages between sellers and buyers
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.