雅思听力中的选择题和填空题经常会出现替换规律的应用，那么替换规律有哪几种又该如何掌握？
A. 简单同义的替换
就是指同一单词的换位解释，一般出现在时间的考题上会比较多。
例如： FORTNIGHT=14 DAYS=2 WEEKS 3 DECADES=30 YEARS SCORE=20 DOZEN=12 UNDER A WEEK= 5 OR 6 DAYS EACH DAY DURING THE WEEK=ON WEEKDAYS REOPEN IN NEXT FEW MONTHS=TEMPORARILY CLOSED ENTRANCE=ACCESS
B. 语义替换
就是进一步的说明它到底是怎么回事。有一种总结、概括之感。
例如：雅思真题上有一篇文章在讲婴儿床，里面就多次出现语义替换。
Base of cot could be moved.= Base of cot could be raised or lowered into two different positions.
婴儿床的底座是可以移动的，然而怎么移动？在听力中给出了详细解释，可以上下移动，这就是语义的替换。
Pictures could be removed easily.= There were pictures which were simply stuck on and so could easily become detached.
同样，也是进一步的阐明到底是怎么一回事。
真题中还有一篇文章在讲回收问题，其中有这样一题。
Glass designed to be utilized for cooking cannot be recycled with other types of glass.=Another difficulty is that toughened glass used for cooking doesn‘t fully melt at the temperature required for other glass， and so that also has to be picked out by hand.
他把玻璃到底是怎么回收的，给出了详细的解释。
然而在听力中，把语义替换放在题目中考察的几率不是很大，所以考生不用太担心，但是它会变成干扰你听音的一个因素。
