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

One hundred and thirteen million Americans have at least one bank-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 bank-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. 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. 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 businessmen 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. 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. 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.
    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.
What is the main idea of this text?
选项 A、Credit cards can bring about many convenient services.
B、Credit cards will be more and more popular.
C、Computers are bringing many efficient services in business.
D、Computers are becoming smarter.
答案C
解析 本文第一段主要讲信用卡带给人们的便利，第二段提到，电脑不仅带给消费者方便的服务，而且对于商业中的销售者也有很多好处。于是后文就主要讲电脑如何在商业中带给人们各种高效的服务。因此从第一段到第三段都在讲电脑带给人们的各种方便高效的服务。因此正确答案是选项C。选项A只是第一段的局部信息，它不能代表整个全文内容。选项B对应第一段的最后一句，也是局部信息。选项D无中生有。
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