GRE Reading Comprehension: JiJing 352-GRE阅读机经352篇 - 17QR5XV4_78DKYMHJ

The passage mentions which of the following as factors that might lead to large temperature swings in Earths polar regions? A. the amount of energy lost due to evaporation at the poles B. soil exposure due to melting snow C. the relatively thin atmosphere at the poles