单选题It can be inferred from the passage that the isotope record taken from ocean sediments would be less useful to researchers if which of the following were true?AIt indicated that lighter isotopes of oxygen predominated at certain times.BIt had far more gaps in its sequence than the record taken from rocks on land.CIt indicated that climate shifts did not occur every 100,000 years.DIt indicated that the ratios of oxygen 16 and oxygen 18 in ocean water were not consistent with those found in fresh water.EIt stretched back for only a million years.
单选题
It can be inferred from the passage that the isotope record taken from ocean sediments would be less useful to researchers if which of the following were true?
A
It indicated that lighter isotopes of oxygen predominated at certain times.
B
It had far more gaps in its sequence than the record taken from rocks on land.
C
It indicated that climate shifts did not occur every 100,000 years.
D
It indicated that the ratios of oxygen 16 and oxygen 18 in ocean water were not consistent with those found in fresh water.
E
It stretched back for only a million years.
参考解析
解析：
推断题。第三段第四句提到：Because of these advantages, sedimentary evidence can be dated with sufficient accuracy by radiometric methods to establish a precise chronology of the ice ages，所以可知如果海底同位素记录失去了其全球性以及延续性，那么其正确性将会大受影响，故B项是正确的。
推断题。第三段第四句提到：Because of these advantages, sedimentary evidence can be dated with sufficient accuracy by radiometric methods to establish a precise chronology of the ice ages，所以可知如果海底同位素记录失去了其全球性以及延续性，那么其正确性将会大受影响，故B项是正确的。
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