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The term e-commerce refers to all commercial transactions conducted over the Internet, including transactions by consumers and business-to-business transactions. Conceptually ,e-commerce does not___1___from well-known commercial offerings such as banking by phone，"mail order" catalogs，or sending a purchase order to supplier via fax. E-commerce follows the same model___2___in other business transactions； the difference ___3___in the details.To a consumer， the most visible form of e-commerce consists of online ordering. A customer begins with a catalog of possible items，__4__an item, arranges a form of payment， and_5_an order. Instead of a physical catalog, e-commerce arranges for catalogs to be___6___on the Internet. Instead of sending an order on paper or by telephone, e-commerce arranges for orders to be sent___7___a computer network. Finally， instead of sending a paper representation of payment such as a check, e-commerce __8__one to send payment information electronically.In the decade after 1993， e-commerce grew from an _9__ novelty(新奇事物)to a mainstream business influence. In 1993， few ___10___ had a web page， and __11__ a handful allowed one to order products or services online. Ten years later，both large and small businesses had web pages， and most ___12___ users with the opportunity to place an order. ___13___ , many banks added online access, and online banking and bill paying became __14__ . More importantly, the value of goods and services ___15___over the Internet grew dramatically after 1997.

From childhood to old age, we all use language as a means of broadening our knowledge of ourselves and the world about us. When humans first（1）, they were like newborn children, unable to use this valuable tool. Yet once language developed, the possibilities for human kinds future（2）and cultural growth increased.　　Many linguists believe that evolution is（3）for our ability to produce and use language. They claim that our highly evolved brain provides us（4）an innate language ability not found in lower organisms. Proponents of this innateness theory say that our（5）for language is inborn, but that language itself develops gradually,（6）a function of the growth of the brain during childhood. Therefore there are critical（7）times for language development.Current（8）of innateness theory are mixed, however, evidence supporting the existence of some innate abilities is undeniable.（9）, more and more schools are discovering that foreign languages are best taught in the lower grades. Young children often can learn several languages by being （10）to them, while adults have a much harder time learning another language once the（11）of their first language have become firmly fixed. Although some aspects of language are undeniably innate, language does not develop automatically in a vacuum. Children who have been （12）from other human beings do not possess language. This demonstrates that （13） with other human beings isnecessary for proper language development. Some linguists believe that this is even more basic to human language（14）than any innate capacities. These theorists view language as imitative, learned behavior.（15） , children learn language from their parents by imitating them. Parents gradually shape their child's language skills by positively reinforcing precise imitations and negatively reinforcing imprecise ones.

In every cultivated language there are two great classes of words which, taken together, comprise the whole vocabulary. First, there are those words （1） which we become acquainted in daily conversation, which we （2） ,that is to say, from the members of our own family and from our familiar associates, and which we should know and use （3）we could not read or write. They （4）the common things of life, and are the stock in trade of all who （5） the language. Such words may be called “popular”, since they belong to the people （6）and are not the exclusive share of a limited class. On the other hand, our language （7） a multitude of words which are comparatively seldom used in ordinary conversation. Their meanings are known to every educated person, but there is little （8） to use them at home or in the market-place. Our （9） acquaintance with them comes not from our mother’s （10）or from the talk of our school-mates, （11） from books that we read, lectures that we （12）,or the more formal conversation of highly educated speakers who are discussing some particular（13） in a style appropriately elevated above the habitual （14） of everyday life. Such words are called “learned”, and the （15） between them and the “popular” words is of great importance to a right understanding of linguistic process.