2. 外语
  3. With the rapid spread of the internet everywhere in the world, and the【C1】______ number of users, one of the most exciting devel

With the rapid spread of the internet everywhere in the world, and the【C1】______ number of users, one of the most exciting devel

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问题      With the rapid spread of the internet everywhere in the world, and the【C1】______ number of users, one of the most exciting developments on the internet is E-commerce-【C2】______ commerce. E-commerce has tow forms,【C3】______ business to-business, or B-to-B, and business-to-consumer, or B-to-C.
     B-to-C was the first of these developments. It grew 【C4】______ from the first days when people started to buy things from their homes without going to a shop. First came "catalogue shopping"【C5】______ you choose what you want from a catalogue【C6】______ pictures and other details of everything that is【C7】______ sale. You then send an order with a check by post and the things you have chosen【C8】______ to your home. Then 【C9】______ "television shopping," where【C10】______ a catalogue, the items for sale are shown or【C11】______ on television.【C12】______ , the customer sends a check and the item is delivered to his or her home. B-to-C is the【C13】______ development, where the "catalogue" is【C14】______  on the internet, combining the advantages of both the book catalogue and the television and indeed adding more【C15】______ . the customer【C16】______ his choice but rather than sending an order and【C17】______ through the post, he places the order and pays for it using his credit card, all using【C18】______ Many people worry about giving details of their credit card over the internet and the danger that it may be fraudulently used.【C19】______ , the general view is that with modern systems of secure encryption the dangers of the misuse of credit cards is【C20】______  greater in a shop, garage or restaurant than in using it for shopping on the internet.
【C3】
选项 A、known of
B、known as
C、knowing as
D、known
答案B
解析 known as business-to-business意思是众所周知的商对商，此句是非限制性定语从句which is known as的省略。
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