gre考试阅读真题解析(B)_GRE阅读

　　 Zoologists have recently discovered that a common marine organism is a natural predator of brachiopods.

　　 It was recently discovered that certain brachiopod species are almost always concentrated near areas rich in offshore oil deposits.

　　 The ratio of specialist to Generalist species is slowly but steadily increasing.

　　 It is easier for a brachiopod to survive a change in sedimentation than a change in water temperature.

　　27. Information in the passage supports which of the following statements about brachiopods?

　　I. Few brachiopods living in prehistoric times were specialists.

　　II. A tendency toward specialization, though typical, is not inevitable.

　　III. Specialist species dominate in all but arctic and subarctic waters.

　　 I only

　　 II only

　　 II and III only

　　 I and III only

　　 I, II and III

答案：17-27：EDBCBCAEAAB

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