TOEFL Reading: ETS-TOEFL阅读机经 - N53R4SXXX5X0TS48L$

According to paragraph 3, the structure of the fins of rhipidistian crossopterygian may have allowed these fish to A. reduce the amount of oxygen needed for survival B. develop thick, sturdy bones C. move more efficiently in water D. move short distances over areas that were mostly dry