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It is hard to imagine life without Arabic numerals (数字). No other number system ever invented has a simple way to write a number

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问题    It is hard to imagine life without Arabic numerals (数字). No other number system ever invented has a simple way to write a number like 1984. In Roman numerals, it comes out like this: MCMLXXXIV. Imagine how difficult it would be for a school pupil to remember it!
   The Arabs, however, call their numbers "Indian numerals". This is probably because they got the original idea a long time ago from India. There were no printed newspapers or scientific magazines then, so mathematics traveled along the same routes that silk did, as businessmen sold and bought goods. The Arabs took the new numbers and made improvements that quickly led to advances in technology.
   The achievement of Arabic technology can be seen from a passage in a 10th-century book about an Arabic city: " The neighboring country showed the results of careful work in agriculture, trade, and industry. Rice and many other plants were grown in fields with water supplied by Arab engineers. The city included 900 public baths, stone-covered streets, fountains, and beautiful buildings. " At this time, London was a small town with dirty streets, and Berlin was a farming village. In fact, cities outside the Arab world did not reach the same level of social development until centuries later.
According to the passage, the Arab people______.
选项 A、did business with the Indians
B、learned some ideas about business from Indians
C、built public baths in London in the 10th century
D、traveled a long way to learn mathematics in Rome
答案A
解析 根据第二段第三句“There were no printed newspapers or scientific magazines then…as businessmen sold and bought goods．”可知，伴着阿拉伯生意人沿丝绸之路买卖商品，数学也随商品流传。由此可推知，阿拉伯人与印度人做过生意。故选A。其他三项都与原文不符。
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