GRE Reading Comprehension: Maggoosh-GRE阅读Maggoosh - F00NZYF72IZJ7GQ7M

Proponents of the uniformitarian view would most likely argue that A. the clay layer actually contained foram too small for Alvarez to detect B. the absence of foram suggested a mass extinction C. iridium could likely be found in the clay layer D. that the lack of forams in the clay reflected a gap in the fossil record E. the orientation of the earth's magnetic field is capable of reversing