第16题: [单项选择]The last important idea mentioned in the passage is ______. A. the invention of the abacus B. the birth of a good computing machine C. the idea of Zero D. the idea of tens or hundreds 参考答案:C 答案解析:[分析] 细节明示题。本文按照时间的顺序列举计数历史的发展,最后一个计数思想应该出现在文章的最后。见最后一段another really important idea was noticed—the