GRE Text Completion: ETS Fundamental-GRE填空ETS基础 - SQA5PH6MI96DH2T3X

In pollen dating, geologic happenings are dated in terms of each other, and one can get just so far by matching (i)____________ sequences; but in radiocarbon dating the scale of time is measured in (ii)____________ terms of centuries or years. A. vague B. absolute C. independent D. relative E. imaginary F. calculable