試題詳解

13.Which of the sentences below best expresses the essential information in the highlighted sentence in the passage?
(A) Even though Ambulocetus swam by moving its bodv up and down. it did not have a backhonp
(B) The backbone of Ambulocetus, which allowed it to swim, provides evidence of its missing fluke.
(C) Although Ambulocetus had no fluke, its backbone structure shows that it swam like modern whales.