题型分类:事实信息题
原文定位:根据 two-dimensional 定位到第二段第四句 But because the contents of the envelopes could easily be forgotten, two-dimensional representations of the three-dimensional tokens were impressed into the surface of the envelopes before they were sealed.因为信封里的内容容易被遗忘,所以用平面符号在信封表面做标记。
选项分析:
D选项正确,二维符号是用来标记信封里的代币的。
A选项说是泥板上画的商品图像,原文没提商品图像。
B选项说是被封入圆锥或圆柱的图像,原文没提。
C选项说是数字,原文没提数字。
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