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托福阅读你肯定不知道的做题套路

2016-03-29 14:45:29来源：新东方在线整理

　　对我们来说，掌握了时间点前后不一致，可以使用反义推理这个方法，能让我们更快的得到答案：

　　The areas covered by this material were so vast that the ice that deposited it must have been a continental glacier larger than Greenland orAntarctica. 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, peoplebegan 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 ofthe 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 yearsago. Along the east coast of the United States, the southernmost advance ofthis ice is recorded by the enormous sand and drift deposits of the terminal moraines that form Long Island and Cape Cod.

　　5.It can be inferred from paragraph 2 that Agassiz and other geologistsof his time were not able to determine

　　○which geographic regions had beencovered with ice sheets in the last ice age

　　○the exact dates at which drifts hadbeen deposited during the last ice age

　　○the exact composition of the driftslaid during the last ice age

　　○how far south along the east coastof the United States the ice had advanced during the last ice age

　　✔解析：

　　• 题干关键词：Agassiz and other geologists of histimewere not able to determine

　　• 文中定位点：We now know the age of theglaciation accurately from radiometric dating of the carbon-14 in logs buriedin the drift.

　　• 利用反义推理：Wenow know ……→Agassiz and other geologists of histimewere not able to determine

　　☞所以选B

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