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  3. The term e-commerce refers to all commercial transactions conducted over the Internet, including transactions by consumers and b

The term e-commerce refers to all commercial transactions conducted over the Internet, including transactions by consumers and b

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问题     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 【C1】______from well-known commercial offerings such as banking by phone, "mail order" catalogs, or sending a purchase order to supplier【C2】______fax. E-commerce follows the same model【C3】______ in other business transactions; the difference【C4】______ in the details.
    To a consumer, the most visible form of e-commerce consists【C5】______online ordering. A customer begins with a catalog of possible items, 【C6】______an item, arranges a form of payment, and【C7】______an order. Instead of a physical catalog, e-commerce arranges for catalogs to be【C8】______on the Internet. Instead of sending an order on paper or by telephone, e-commerce arranges for orders to be sent【C9】______ a computer network. Finally, instead of sending a paper representation of payment such as a check, e-commerce 【C10】______one to send payment information electronically.
    In the decade【C11】______1993, e-commerce grew from an【C12】______novelty to a mainstream business influence. In 1993, few【C13】______had a web page, and【C14】______a handful allowed one to order products or services online. Ten years【C15】______, both large and small businesses had web pages, and most【C16】______users with the opportunity to place an order. 【C17】______, many banks added online access,【C18】______online banking and bill paying became【C19】______. More importantly, the value of goods and services【C20】______over the Internet grew dramatically after 1997.
【C12】
选项 A、optional
B、invalid
C、occasional
D、insignificant
答案D
解析 考查逻辑关系及形容词辨析。分析句子可知，空格处需要填入的形容词应该与mainstream(主流的)构成对比关系，故排除optional“可选择的”，invalid“无效的”两项。电子商务的出现并不是“偶然的”，所以排除occasional。只有“‘微不足道的’新奇事物”符合句意，因此正确答案为D．insignificant“微不足道的”。
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考研英语一

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