TOEFL Reading: ETS-TOEFL阅读机经 - 5_463VQK9SO3K6IZL$

According to paragraph 4, John Joly's calculations were founded on all the following EXCEPT A. knowing how salty the ocean water is B. estimating how much salt enters the ocean each year C. accounting for the amount of salt that is recycled D. figuring the volume of water contained in the ocean