GRE Reading Comprehension: ETS-GRE阅读ETS - 2E3Z96C04FHE30P07

Which one of the following is presented by the author as evidence of controlled burning in the tropics before the arrival of Europeans? A. extensive homogeneous forests at high elevation B. extensive homogeneous forests at low elevation C. extensive heterogeneous forests at high elevation D. extensive heterogeneous forests at low elevation E. extensive sedimentary charcoal accumulations at high elevation