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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題目解析 這道題目要求我們理解段落4中...