8. The purpose of the last paragraph of the passage is to
offer a note of caution提出令人警戒的注意事项
introduce new evidence
present two recent discoveries
summarize material in the preceding paragraphs
offer two explanations for a phenomenon从全文的布局看,不是提供解释
9. According to the passage, one advantage of studying the isotope record of ocean sediments is that it
corresponds with the record of ice volume taken from rocks on land
shows little variation in isotope ratios when samples are taken from different continental locations地理连续性
corresponds with predictions already made by climatologists and experts in other fields
confirms the record of ice volume initially established by analyzing variations in volcanic emissions
provides data that can be used to substantiate records concerning variations in the amount of sunlight received by the Earth
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