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In the passage, the author is primarily interested in______ [br] According to th
In the passage, the author is primarily interested in______ [br] According to th
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2025-02-26
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问题
In the passage, the author is primarily interested in______ [br] According to the passage, which of the following is true of the ratios of oxygen isotopes in ocean sediments?
选项
A、They indicate that sediments found during an ice age contain more calcium carbonate than sediments formed at other times.
B、They are less reliable than the evidence from rocks on land in determining the volume of land ice.
C、They can be used to deduce the relative volume of land ice that was present when the sediment was laid down.
D、They are more unpredictable during an ice age than in other climatic conditions.
E、They can be used to determine atmospheric conditions at various times in the past.
答案
C
解析
C is the best answer. Lines 13-16 state that the relative volume of land ice can be deduced from the ratio of oxygen 18 to oxygen 16 in ocean sediments. A, D and E are incorrect because there is no information in the passage to support these statements. B is incorrect because it contradicts lines 43-45, in which the author states that ocean sediment provides “a more continuous record than that taken from rocks on land.”
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