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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

　　With question such as these clearly before them, the scientists aboard the Glomar Challenger processed to the Mediterranean to search for the answers.On August 23, 1970, they recovered a sample. The sample consisted of pebbles of hardened sediment that had once been soft, deep-sea mud, as well as granules of gypsum and fragments of volcanic rock. Not a single pebble was found that mighthave indicated that the pebbles came from the nearby continent. In the days following, samples of solid gypsum were repeatedly brought on deck as drilling operations penetrated the seafloor. Furthermore, the gypsum was found to possess peculiarities of composition and structure that suggested it had formed on desert flats. Sediment above and below the gypsum layer contained tiny marine fossils, indicating open-ocean conditions. As they drilled into the central and deepest part of the Mediterranean basin, the scientists took solid,shiny, crystalline salt from the core barrel. Interbedded with the salt were thin layers of what appeared to be wind blown silt.

　　4.Which of the following can beinferred from paragraph 3 about the solid gypsum layer?

　　○It did not contain any marine fossil.

　　○It had formed in open-ocean conditions.

　　○It had once been soft, deep-sea mud.

　　○It contained sediment from nearby deserts.

　　✔解析：

　　这道题很容易，和上一题是同样的套路

　　• 题干关键词：the solid gypsum layer

　　• 文中定位点：Sediment above and below the gypsumlayer contained tiny marine fossils, indicating open-ocean conditions.

　　• 利用反义推理：在石膏层上面和下面的沉积层中包含小海洋化石→石膏层不包含海洋化石

　　☞所以选A

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