gre阅读练习每日一篇(四十一)_GRE阅读

gre阅读练习每日一篇(四十一)

　　16. The passage provides information for answering which of the following questions?

　　 What causes warm-water vents to form?

　　 Do vent faunas consume more than do deep-sea faunas of similar size?

　　 Do bacteria live in the vent water of smokers?

　　 What role does hydrogen sulfide play in chemosynthesis?

　　 What accounts for the locations of deep-sea smokers?

　　17. The information in the passage suggests that the majority of deep-sea faunas that live in nonvent habitats have which of the following characteristics?

　　 They do not normally feed on particles of food in the water.

　　 They are smaller than many vent faunas.

　　 They are predators.

　　 They derive nutrition from a chemosynthetic food source.

　　 They congregate around a single main food source.

　　18. The primary purpose of the passage is to

　　 describe a previously unknown natural phenomenon

　　 reconstruct the evolution of a natural phenomenon

　　 establish unequivocally the accuracy of a hypothesis

　　 survey explanations for a natural phenomenon and determine which is best supported by evidence

　　 entertain criticism of the authors research and provide an effective response

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