雅思阅读：是非无判断题难点

　　1. 关于False和Not Given的解释

　　Students generally find this type of exercise rather difficult. One reason is that they are used to doing true and false exercises where the false covers false and not given. Then when they come to do true, false or not given, they cannot make the distinction between the three different types of contradiction and not given. It is therefore important that students are able to understand what false means in true, false and not given. There are three types of contradictions:

　　学生通常发现这种题型很难。其中的原因之一是这些学生习惯于做true和false题目，其中的false涵盖了false和not given两种情况。所以当学生在做true, false和 not given的题目时他们无法区分三个不同种类的矛盾对立状况和not given的区别。因此，学生要理解false的含义。总共有三种矛盾对立状况：

　　statements which are the opposite of the original text.

　　命题与原文内容对立。

　　statements which are the opposite of the original text, because they are negative.

　　命题与原文对立，因为命题否定原文内容。

　　statements where the information is not the opposite or negative, but the information in the statement contradicts that given in the text.

　　命题信息既不对立也不否定，但是和原文内容矛盾。

　　Look at the examples below relating to the text and exercises:

　　Example 1

　　原文：Hurricanes have winds of at least 74 miles per hour.

　　题目：Hurricanes are winds with the speed of up to 74 miles per hour.

　　分析：由于原文中的核心内容是at least 74 miles per hour，而题目中是up to 74 miles per hour。因此，这就是False的第一种情况：命题与原文内容对立。

　　Example 2

　　原文：As forecasting improved communities were no longer surprised by hurricanes and could take measures to evacuate ahead of the storm. While destruction still continues, the number of deaths in hurricanes has dropped significantly.

　　题目：The destruction caused by hurricanes has ceased due to improvements in forecasting.

　　分析：原文的核心内容是While destruction still continues，而题目中的内容是The destruction caused by hurricanes has ceased。因此，这就是False的第二种情况：命题否定原文内容。

　　Example 3

　　原文：In 1609, a fleet of ships carrying settlers from England to Virginia USA was struck by a hurricane. Some of the ships were damaged and part of the fleet grounded on Bermuda, an isolated nation in the Atlantic. These passengers became the first people to live on Bermuda.

　　题目：The first people to live on Bermuda were settlers who chose to live there as alternative to England.