GRE Reading Comprehension: ETS-GRE阅读ETS - Z882HM868GCN74GA7

According to the passage, if the average geothermal gradient in an area is 22℃ per kilometer of depth, which of the following can be reliably predicted? A. The temperature at the base of a 10-kilometer well will be sufficient for the production of electricity. B. Drilling of wells deeper than 10 kilometers will be economically feasible. C. Insufficient water is present to produce eruptive phenomena.