GRE Text Completion: ETS Fundamental-GRE填空ETS基础 - 1VKHBOAFPREJMD4KX

Some paleontologists debate whether the diversity of species has (i)____________ since the Cambrian period, or whether imperfections in the fossil record only suggest greater diversity today, while in actuality there has been either (ii)____________ or decreased diversity. A. change B. stasis C. declined D. escalation E. increased F. discontinuity