这四大雅思阅读关键词是：
1. 表示因果类关键词：as a result, result in, result from, lead to, because of, due to, contribute to, owning to, hence, since, accordingly, consequently, therefore, in that, etc.
2. 表示转折类关键词：despite, in spite of, but, although, though, while, yet, otherwise, on the other hand, however, nevertheless, nonetheless, etc.
3. 表示比较类关键词：more, than, less, the least, the most, prefer, equally, likewise, similarly, in comparison, as…as, etc.
4. 表示并列类关键词：first, second…finally, and, or, as well as, one… the other,not…nor…, etc.
这些都是雅思阅读真题题源中的连接词归类和汇总，占据了相当大的关键词份额。雅思阅读高频词汇当中也有这些词汇的存在。所以，学生应该将这些词汇牢记于心。