gre考试阅读真题解析(A)_GRE阅读

gre考试阅读真题解析(A)

　　22. The passage suggests that the scientists who first constructed a coherent, continuous picture of past variations in marine-sediment isotope ratios did which of the following?

　　 Relied primarily on the data obtained from the analysis of Emilianis core samples.

　　 Combined data derived from the analysis of many different core samples.

　　 Matched the data obtained by geologists with that provided by astronomers.

　　 Evaluated the isotope-ratio data obtained in several areas in order to eliminate all but the most reliable data.

　　 Compared data obtained from core samples in many different marine environments with data samples derived from polar ice caps.

　　23. The passage suggests that the scientists mentioned in line 8 considered their reconstruction of past astronomical cycles to be

　　 unreliable because astronomical observations have been made and recorded for only a few thousand years

　　 adequate enough to allow that reconstructions use in explaining glacial cycles if a record of the latter could be found

　　 in need of confirmation through comparison with an independent source of information about astronomical phenomena

　　 incomplete and therefore unusable for the purposes of explaining the causes of ice ages

　　 adequate enough for scientists to support conclusively the idea that ice ages were caused by astronomical changes

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