26. The word "some" in line 14 refers to (A) Archaeologists (B) Sumerians (C) years (D) clay tablets

25. According to the passage, by the year 3000 B.C. the Sumerians had already done all of the following EXCEPT: (A) They had abandoned the area north of the Persian Gulf. (B) They had established themselves in cities. (C) They had started to communicate through (D) They had created bronze tools and weapons.