题目内容
With the (39 ) evolution of society, simple counting became necessary. A tribe had to know how many members it had and how many enemies, and shepherd needed to know (40 ) the ; flock of sheep was decreasing in size. Probably the earliest way of keeping a count was by some simple tally (计算, 记录) method, (41 ) the principle of one-to-one correspondence. In(42 ) a count of sheep, for example, one finger per sheep could be (43 ) . Counts could also be (44 ) by making scratches in the dirt or on a stone, by cutting notches in a piece of wood, or by tying knots in a string. (45 ) , perhaps later, an assortment of vocal (46 ) was developed as a word tally against the number of objects in a small group. And (47 ) later, with the development of writing, a set of(48 ) was invented to stand for these numbers. Such an imagined development is (49 ) by reports of anthropologists in their studies of present-day societies that are (50 ) to be similar to those of early humans.
31.
[A] after
[B] before
[C] ahead
[D] ago
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