TOEFL Reading: ETS-TOEFL阅读机经 - A7J2SG0L6_VJ0Z7IL$

According to paragraph 2, all of the following played a role in keeping carbon dioxide levels high in the atmosphere of Venus EXCEPT A. the breaking apart of water molecules by ultraviolet rays B. the evaporation of water released from the planet's interior C. the escape of hydrogen into space D. the release of molecules from melting metals such as lead