7. The hind leg of Basilosaurus was a significant find because it showed thatBasilosaurus

　　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

　　8. It can be inferred that Basilosaurus bred and gave birth in which of the followinglocations

　　A.On land

　　B.Both on land and at sea

　　C.In shallow water

　　D.In a marine environment

　　9. Why does the author use the word luckily in mentioning that the Ambulocetusnatans fossil included hind legs?

　　A.Fossil legs of early whales are a rare find.

　　B.The legs provided important information about the evolution of cetaceans.

　　C.The discovery allowed scientists to reconstruct a complete skeleton of the whale.

　　D.Until that time, only the front legs of early whales had been discovered.

　　10. Which of the sentences below best expresses the essential information in thehighlighted sentence in the passage?

　　A.Even though Ambulocetus swam by moving its body up and down, it did not have abackbone.

　　B.The backbone of Ambulocetus, which allowed it to swim, provides evidence of its missingfluke.

　　C.Although Ambulocetus had no fluke, its backbone structure shows that it swam like modernwhales.

　　D.By moving the rear parts of their bodies up and down, modern whales swim in a different wayfrom the way Ambulocetus swam.

　　11. The word propulsion(paragraph 5)in the passage is closest in meaning to

　　A.Staying afloat

　　B.Changing direction

　　C.Decreasing weight

　　D.Moving forward

　　12. Look at the four squares [■] that indicate where the following sentence can beadded to the passage.Where would the sentence best fit?

　　This is a question that has puzzled scientists for ages.

　　Extinct but already fully marine cetaceans are known from the fossil record. ■【A】How was thegap between a walking mammal and a swimming whale bridged? ■【B】Missing until recentlywere fossils clearly intermediate, or transitional, between land mammals andcetaceans.■【C】Very exciting discoveries have finally allowed scientists to reconstruct themost likely origins of cetaceans. ■【D】In 1979, a team looking for fossils in northern Pakistanfound what proved to be the oldest fossil whale.

　　13. Directions: An introductory sentence for a brief summary of the passage isprovided below. Complete the summary by selecting the THREE answer choices thatexpress the most important ideas in the passage. Some answer choices do not belongin the summary because they express ideas that are not presented in the passage orare minor ideas in the passage. This question is worth 2 points.

　　This passage discusses fossils that help to explain the likely origins of cetaceans-whales,porpoises, and dolphins.

　　A.Recent discoveries of fossils have helped to show the link between land mammals andcetaceans.

　　B.The discovery of Ambulocetus natans provided evidence for a whale that lived both on landand at sea.

　　C.The skeleton of Basilosaurus was found in what had been the Tethys Sea, an area rich infossil evidence.

　　D.Pakicetus is the oldest fossil whale yet to be found.

　　E.Fossils thought to be transitional forms between walking mammals and swimming whaleswere found.

　　F.Ambulocetus' hind legs were used for propulsion in the water.

　　tpo2閱讀答案

　　1-6. BACCAB

　　7-12.DDBCDB

　　13. ABE