n 在每年的英语四级考试中，我们发现完型填空题在整个四级考试中占有比较重要的位置，很多考生反映较难，失分率过高，今天精选各大机构的完型填空讲义，希望能给广大考生有所帮助，以下是小编给大家整理的大学英语四级完型填空解析讲义-12，希望可以帮到大家
nn 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 2 fax. e-commerce follows the same model 3 in other business transactions; the difference 4 in the details.
nn to a consumer， the most visible form of e-commerce consists 5 online ordering. a customer begins with a catalog of possible items， 6 an item， arranges a form of payment， and 7 an order. instead of a physical catalog， e-commerce arranges for catalogs to be 8 on the internet. instead of sending an order on paper or by telephone， e-commerce arranges for orders to be sent 9 a computer network. finally， instead of sending a paper representation of payment such as a check， e-commerce 10 one to send payment information electronically.
nn in the decade 11 1993， e-commerce grew from an 12 novelty ( 新奇事物) to a mainstream business influence. in 1993， few 13 had a web page， and 14 a handful allowed one to order products or services online. ten years 15 ， both large and small businesses had web pages， and most 16 users with the opportunity to place an order. 17 ， many banks added online access， 18 online banking and bill paying became 19 . more importantly， the value of goods and services 20 over the internet grew dramatically after 1997.
nn 1. a)distract b) descend c)differ d) derive
nn 2. a) with b) via c) from d) off
nn 3. a) appeared b) used c) resorted d) served
nn 4. a) situates b) lies c) roots d) locates
nn 5. a) on b) of c) for d) to
nn 6. a) reflects b) detects c) protects d) selects
nn 7. a) sends in b) puts out c) stands for d) carries away
nn 8. a) visible b) responsible c) feasible d) sensible
nn 9. a) beside b) over c) beyond d) up
nn 10. a) appeals b) admits c) advocates d) allows
nn 11. a) after b) behind c) until d) toward
nn 12. a) optional b) invalid c) occasional d) insignificant
nn 13. a) communities b) corps c) corporations d) compounds
nn 14. a) largely b) slightly c) solely d) only
nn 15. a) lately b) later c) late d) latter
nn 16. a) offered b) convinced c) equipped d) provided
nn 17. a) instead b) nevertheless c) however d) besides
nn 18. a) and b) or c) but d) though
nn 19. a) different b) flexible c) widespread d) productive
nn 20. a) acquired b) adapted c) practiced d) proceeded
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n 答案：
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n 1.c。考动词词义辨析，而且是考与from的搭配，有三个选项可以入选，a distract…from“分散;使分心”;c differ … from“与……不同”;d derive … from “起源;源自”;根据句意a、d均不符合题意，所以答案是c.
nn 2.b。via 通过;through。
nn 3.b。appear, appearance反义词：disappear, disappearance。
nn 4.b。lie lied lied 撒谎，lay laid lain 放置;处于
nn lay laid laid 下蛋，lie in 在于，tell a lie 说谎，
nn liar 骗子。
nn 5.b。表示组成的四个短语consist of ，be made up for，be composed of ，be comprised of 。
nn 6.d。考察collect, gather , select的区别。collection, a collection of 。
nn 7.a。virtual 虚拟的，visible 看得见的，vision 视野;远景，visual 视觉的，virtue 美德。
nn 8.a。考形容词词义辨析，此题可以利用本段中心主题句中出现的复现关系推出答案选项是a.
nn 9.b。
nn 10.d。考动词词义辨析， appear 是不及物动词，一般与for连用，译为“呼吁”;admit 一般跟动名词作宾语，译为“容许， 承认”;advocate是及物动词“提倡， 鼓吹”;allow sb to do “允许某人做某事”，根据原文判断只有d符合题意。
nn 11.a。
nn 12.d。
nn 13.c。考名词词义辨析，community “社区，团体”;corp如果首字母大写corp是公司的缩写，所以此单词是错误的;corporation “公司，企业”;compound“混合物，化合物”，此题可以通过同意替换的方法做题，下文中提到small business，与其意思相近的选项是c.
nn 14.d。
nn 15.b。考形近词辨析，lately与recently同义，译为“最近”;later “多长时间之后”，常与时间词连用;late “晚， 迟， 最近， 在晚期”，常表示晚于通常时间的;latter 指“两者之中的后者”，根据句意答案是b.
nn 16.d。考动词词义辨析， offer sb to do sth“向某人提供”，一般表示主动的给予;convince sb of sth 或convince sb that 常用被动语态，译为“使某人信服;使某人确信”;equip “装备， 配备”，常与with连用;provide sb with sth “将某物提供给某人”，provide sth for sb “为某人提供某物”，根据句意所以答案选择d.
nn 17.d。
nn 18.a。
nn 19.c。考形容词词义辨析，different “不同的”;flexible “的， 灵活的， 柔软的， 能变形的”;widespread “分布广泛的， 普遍的”;productive “生产的，多产的”，此题根据本段中心主题句判断出答案选项是c.
nn 20.a。