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　　1、推理题的象征

　　推理题干一般包含infer， imply, most likely, least likely, probably等词，分为有共性的推理题和无共性的推理题。

　　二、推理题的做法

　　对于无共性的推理题，即题干中的无线索，一般采用枚举法，即根据每个选项的关键词回到原文定位，通过枚举法得到正确答案。

 

 

　　对于常见的推理问题，即如果题干中有线索，可以先选择题目中的关键词，根据关键词回到原文定位，再进行推理。推理题主要有以下思路:

　　1.一般比较推理

　　ETS设计推理问题的方法并不多，根据两件事的对比特征就是其中之一。当被问及其中一件事的特征时，否认另一件事的特征。例如：

　　It should be obvious that cetaceans–whales, porpoises, and dolphins–are mammals. They breathe through lungs, not through gills, and give birth to live young. Their streamlined bodies, the absence of hind legs, and the presence of a fluke and blowhole cannot disguise their affinities with land-dwelling mammals. However, unlike the cases of sea otters and pinnipeds (seals, sea lions, and walruses whose limbs are functional both on land and at sea), it is not easy to envision what the first whales looked like.

　　2. Which of the following can be inferred from paragraph 1 about early sea otters?

　　It is not difficult to imagine what they looked like.

　　There were great numbers of them.

　　They lived in the sea only.

　　They did not leave many fossil remains.

　　根据关键词sea otters定位第四句：However,unlikethecasesofsea ottersandpinnipeds..从原文的unlike可以看出sea otters和pinipeds与whales形成对比，难以想象原始whales的样子；按照“一般对比推理”的思路，可以推出“原始sea” Otters的样子不难想象。一个选项表达了这个意思，为了正确答案。

　　2.时间对比推理

　　这种想法经常被测试。在这种推理中，通常有两个形成对比的时间点，它们的特征通常是相反的。当主题询问一个时间段的特征时，只要否认相反时间点的特征。

　　例一：

　　Basic to any understanding of Canada in the 20 years after the Second World War is the country’s impressive population growth….

　　…It appeared that Canada was once more falling in step with the trend toward smaller families that had occurred all through the Western world since the time of the Industrial Revolution.

　　…

　　It can be inferred from the passage that before the Industrial Revolution

　　(A)families were larger.

　　(B)population statistics were unreliable.

　　(C)the population grew steadily.

　　(D)economic conditions were bad.

　　工业革命后与工业革命前两次形成对比。既然工业革命后西方世界的家庭变小了，那么工业革命前的家庭一定比较大。所以(A)正确答案。

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