gre阅读练习每日一篇(九)_GRE阅读

gre阅读练习每日一篇(九)

　　I. Do temperature variations and isotopic changes in seawater cause the 18O/16O ratio to shift in the same direction?

　　II. What are the methods used to determine the 18O/16O ratio?

　　III. Is the study of racemization reactions useful in estimating climatic changes that occurred during Pleistocene glacial cycles if only one of the two important variables is known?

　　I only

　　I and II only

　　I and III only

　　II and III only

　　I, II, and III

　　27. According to the passage, before the recent experiments described in the passage were completed, scientists could

　　determine temperatures only for Pleistocene seas

　　determine temperatures that occurred during Pleistocene glacial cycles only by examining fossil remains

　　measure changes in temperatures that occurred during Pleistocene glacial cycles with only questionable accuracy

　　only partially identify factors tending to lower Pleistocene temperatures

　　accurately determine temperatures only for land masses affected by glaciation

　　答案：17-27：ABCDAECDECC

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