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为什么tpo19阅读的section2少一道题,23题,有人知道是什么题吗

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为什么tpo19阅读的section2少一道题,23题,有人知道是什么题吗
你下载的不完整吧亲.
再问: 我上网找了很多,都是差这么一道题,你有么
再答: 9. According to paragraph 4, scientists use foraminifera shells to learn about Pleistocene ocean conditions by O measuring the amount of calcium carbonate present in the shells O determining the proportion of shell in each layer of sediment O comparing shells deposited during the Pleistocene with those buried earlier O calculating the relative quantity of two oxygen isotopes in the calcite