64. Rothschild might have concluded that ichthyosaurs ______.
(A) failed to evolve an anti-decompression means
(B) gradually developed measures against the bends
(C) died out because of large sharks and crocodiles
(D) evolved an anti-decompression means but soon lost it

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統計： A(0), B(0), C(0), D(1), E(0) #495128