[B] obtain more convenient services than other people do

　　[C] enjoy greater trust from the storekeeper

　　[D] cash money wherever he wishes to

　　56. From the last sentence of the first paragraph we learn that __.

　　[A] in the future all the Americans will use credit cards

　　[B] credit cards are mainly used in the United States today

　　[C] nowadays many Americans do not pay in cash

　　[D] it is now more convenient to use credit cards than before

　　57. The phrase "ring up sales" (Line 3, Para. 2) most probably means "__".

　　[A] make an order of goods

　　[B] record sales on a cash register

　　[C] call the sales manager

　　[D] keep track of the goods in stock

　　58. What is this passage mainly about?

　　[A] Approaches to the commercial use of computers.

　　[B] Conveniences brought about by computers in business.

　　[C] Significance of automation in commercial enterprises.

　　[D] Advantages of credit cards in business.

　　[第55题答案及题解页数] B 第页

　　[第56题答案及题解页数] C 第页

　　[第57题答案及题解页数] B 第页

　　[第58题答案及题解页数] B 第页

　　[长难句突破]