单选题 Although literacy appeared independently in several parts of the prehistoric world, the earliest evidence of writing is the cuneiform Sumerian script on the clay tablets of ancient Mesopotamia, which, archeological detective work has revealed, had its origins in the accounting practices of commercial activity. Researchers demonstrated that preliterate people, to keep track of the goods they produced and exchanged, created a system of accounting using clay tokens as symbolic representations of their products. Over many thousands of years, the symbols evolved through several stages of abstraction until they became wedge-shaped (cuneiform) signs on clay tablets, recognizable as writing. Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information.

A、 Sumerian script, the earliest known form of writing among prehistoric writing systems, was first used on clay tablets for accounting purposes.
B、 Although the earliest Sumerians engaged in commercial activity and practiced accounting, they were not as literate as people in other parts of the prehistoric world.
C、 Archeologists have discovered that literacy was developed in several parts of the world, including ancient Mesopotamia.
D、 Archeological detective work has revealed the commercial accounting practices of the Sumerians of ancient Mesopotamia and provided a written record of their intense commercial activity.

【正确答案】 A

【答案解析】