TPO19阅读第三篇第5题 原文The areas covered by this material were so vast that the ice that deposited it must have been a continental glacier larger than Greenland or Antarctica.Eventually,Agassiz and others convinced geologists and the gener

TPO19阅读第三篇第5题 原文The areas covered by this material were so vast that the ice that deposited it must have been a continental glacier larger than Greenland or Antarctica.Eventually,Agassiz and others convinced geologists and the gener
TPO19阅读第三篇第5题
原文
The areas covered by this material were so vast that the ice that deposited it must have been a continental glacier larger than Greenland or Antarctica.Eventually,Agassiz and others convinced geologists and the general public that a great continental glaciation had extended the polar ice caps far into regions that now enjoy temperate climates.For the first time,people began to talk about ice ages.It was also apparent that the glaciation occurred in the relatively recent past because the drift was soft,like freshly deposited sediment.We now know the age of the glaciation accurately from radiometric dating of the carbon-14 in logs buried in the drift.The drift of the last glaciation was deposited during one of the most recent epochs of geologic time,the Pleistocene,which lasted from 1.8 million to 10,000 years ago.Along the east coast of the United States,the southernmost advance of this ice is recorded by the enormous sand and drift deposits of the terminal moraines that form Long Island and Cape Cod.
It can be inferred from paragraph 2 that Agassiz and other geologists of his time were not able to determine
A.which geographic regions had been covered with ice sheets in the last ice age
B.the exact dates at which drifts had been deposited during the last ice age
C.the exact composition of the drifts laid during the last ice age
D.how far south along the east coast of the United States the ice had advanced during the last ice age
可是文章不已经明确说用碳14测量出时间了么?

TPO19阅读第三篇第5题 原文The areas covered by this material were so vast that the ice that deposited it must have been a continental glacier larger than Greenland or Antarctica.Eventually,Agassiz and others convinced geologists and the gener
这个题有点象考研英语了,题目中关键词是infer 显然是暗示和推测,就已给的这一段原文来看,这个A开头的人显然是个已故的学者,他那时候刚开始谈论冰河世纪,是一个概念的提出者,决定选项的原文关键词是“we now"know...也就是说,之前的不是now,之前没法准确判断年代,之前的时态是过去式,这个题原文没有明确的说但是从语境和时态infer出来的