問題詳情

3. The Mesopotamians were the people who invented abstract numbers. To manage their regular commercial activities, they needed accurate 21______ methods. It is said that it 22______ them a while to figure out the base-60 number system. This system was 23______ a set of symbols called numerals, which were used to represent the numbers. 24______ the same value, these numerals made counting much faster. Today we can still see traces of the base-60 number system left behind by Mesopotamians. 25______, the use of numerals to represent abstract numbers has made life much more convenient for many civilizations down through the ages, including our own.
21
(A) to count
(B) to be counted
(C) counting
(D) and counted

參考答案

答案：C
難度：困難0.375
統計：A(3),B(0),C(3),D(0),E(0)

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