gre阅读练习每日一篇(九)_GRE阅读

gre阅读练习每日一篇(九)

　　24. It can be inferred from the passage that determination of the temperatures mentioned in line 17 through 18O/16O ratios and determination through racemization reactions both require which of the following?

　　Calcium deposits known to be from Pleistocene seas

　　Proteins containing both L-amino acids and D-amino acids

　　Glacial debris from both before and after the Pleistocene period

　　Fossil material from organisms living during the Pleistocene period

　　Proteins containing both amino acids and 18O

　　25. The passage suggests that the 18O/16O ratio could be used more successfully as a means of measurement if scientists were able to

　　determine the 18O/16O ratio in living animals as well as in fossil remains

　　locate a greater number of calcareous fossils from the Pleistocene glacial and interglacial cycles

　　locate the factors other than temperature fluctuations and isotopic changes in seawater that affect the 18O/16O ratio

　　arrive at more exact determinations of which amino acids are found in the proteins of living organisms

　　isolate the relative effects of temperature fluctuations and isotopic changes in seawater on 18O/16O ratios

　　26. The information in the passage can be used to answer which of the following questions?

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