参考答案：A

解析：[听力原文] On September 13,1956, IBM shipped the first unit of the RAMAC, in other words, Random Access Method of Accounting and Control. The RAMAC, designed in Big Blue’s San Jose, Calif., research center would have made a lousy music player. The drive weighed a full ton, and to lease it you’d pay about ＄250,000 a year in today’s dollars. Since it required a separate air compressor to protect the two moving "heads" that read and wrote information, it was noisy. The total amount of information stored in its 50 spinning iron-oxide-coated disks-- each of them a pizza-size 24 inches -- was 5 megabytes.

[分析]： 事实细节的找寻和判断。 根据原文The RAMAC，designed in Big Blue’s San Jose，Calif.，research center 可知B项中The IBM research center与原文不符，C中24 spinning disks 与原文its 50 spinning... disks不符，D中＄260，000与原文to lease it you’d pay about ＄250,000 a year in today’s dollars 不符，因此均被排除。而A与原文The drive weighed a full ton 相符，因此该项为正确答案。[解题关键] 根据各选项中关键词定位到原文相关信息，将选项内容与原文比较。有时可根据选项内容的特点，先排除干扰项，最后剩下的选项即为正确答案。如本题中B、 C、D三项内容均含有易识别信息，如专有名词或数字等，很容易定位其原文中相关信息以判断正误。