（A） An animal's brain size has little bearing on its ability to master complex behaviors.

　　（B） An animal's appearance is often influenced by environmental requirements and physical capabilities.

　　（C） Animals within a given family group are unlikely to change their appearance dramatically over a period of time.

　　（D） The origin of flight in vertebrates was an accidental development rather than the outcome of specialization or adaptation.

　　（E） The pterosaurs should be classified as birds， not reptiles.

　　5.It can be inferred from the passage that which of the following is characteristic of the pterosaurs？

　　（A） They were unable to fold their wings when not in use.

　　（B） They hung upside down from branches as bats do before flight.

　　（C） They flew in order to capture prey.

　　（D） They were an early stage in the evolution of the birds.

　　（E） They lived primarily in a forest like habitat.

　　6.Which of the following best describes the organization of the last paragraph of the passage？

　　（A） New evidence is introduced to support a traditional point of view.

　　（B） Three explanations for a phenomenon are presented， and each is disputed by means of specific information.

　　（C） Three hypotheses are outlined， and evidence supporting each is given.

　　（D） Recent discoveries are described， and their implications for future study are projected.

　　（E） A summary of the material in the preceding paragraphs is presented， and conclusions are drawn.

　　7.It can be inferred from the passage that some scientists believe that pterosaurs

　　（A） lived near large bodies of water

　　（B） had sharp teeth for tearing food

　　（C） were attacked and eaten by larger reptiles

　　（D） had longer tails than many birds

　　（E） consumed twice their weight daily to maintain their body temperature