2010年6月份四级完形填空真题及答案The term e-commerce refers to all commercial transactions conducted over the Internet, including transactions conducted over the Internet, including transactions by consumers and business-to-business transactions. Conceptually, e-commerce does not -67- from well-known commercial offerings such as banking by phone, mail order catalogs, or sending a purchase order to a supplier -68- fax. Ecommerce follows the same model -69- in other business transactions; the difference -70