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  3. One hundred and thirteen million Americans have at least one hank-issued credit card. They give their owners automatic credit in

One hundred and thirteen million Americans have at least one hank-issued credit card. They give their owners automatic credit in

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问题     One hundred and thirteen million Americans have at least one hank-issued credit card. They give their owners automatic credit in stores, restaurants, and hotels, at home, across the country, and even abroad, and they make many banking services available as well. (46)More and more of these credit cards can be read automatically, making it possible to withdraw or deposit money in scattered locations, whether or not the local branch bank is open. For many of us the "cashless society" is not on the horizon—it’s already here.
    While computers offer these conveniences to consumers, they have many advantages for sellers too. (47)Electronic cash registers can do much more than simply ring up sales. They can keep a wide range of records, including who sold what, when, and to whom. This information allows business- men to keep track of their list of goods by showing which items are being sold and how fast they are moving. Decisions to reorder or return goods to suppliers can then be made. (48)At the same time these computers record which hours are busiest and which employees are the most efficient, allowing personnel and staffing assignments to be made accordingly. And they also identify preferred customers for promotional campaigns. Computers are relied on by manufacturers for similar reasons.
(49) Computer-analyzed marketing reports can help to decide which products to emphasize now,
which to develop for the future, and which to drop. Computers keep track of goods in stock, of raw materials on hand, and even of the production process itself.
    (50) Numerous other commercial enterprises, from theaters to magazine publishers, from gas and electric utilities to milk processors, bring better and more efficient services to consumers through the use of computers.
选项
答案与此同时，这些计算机记录哪些时间段是高峰，哪些员工的工作效率蕞高，使商家可以对人事和员工做出相应地分配。
解析 第一个句子的主语是these computers，谓语是record，后面有两个以and连接的宾语从句which hours are busiest和which employers are the most efficient，作record的宾语；逗号之后的分词结构作全句的状语。
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