It suggests that turtles, whales, and dugongs evolved in separate parts of the world.
It undermines the view that turtles, whales, and dugongs are all descended from terrestrial ancestors.
It is the primary difference between turtles, whales, and dugongs, on the one hand, and pinnipeds, on the other.
27. In presenting the argument in the passage, the author does which of the following?
Contends that key terms in an opposing view have been improperly used.
Contends that opponents have purposely obscured important evidence.
Shows that two theories thought to be in conflict are actually complementary.
Shows that advocates of a theory have not always stated their view in the same manner.
Shows that an implication of a theory is contradicted by the facts.
答案:17-27:DEDEDBDACBE
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