18. In paragraph 4, the hind leg of Basilosaurus was a significant find because it showed that Basilosaurus ________________________.
(A)lived later than Ambulocetus natans
(B) lived at the same time as Pakicetus
(C) was able to swim well
(D)could not have walked on land

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統計: A(0), B(0), C(1), D(5), E(0) #3293658

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