1. 相同詞性的同義替換：
相同詞性的同義替換一般指的是只涉及單個(gè)單詞的轉(zhuǎn)換。單個(gè)單詞的轉(zhuǎn)換包括詞性轉(zhuǎn)換及同義詞轉(zhuǎn)換。其中詞性轉(zhuǎn)換是相對(duì)簡(jiǎn)單的一種，詞匯量可觀的考生自然可以游刃有余，輕松應(yīng)對(duì);即便不認(rèn)識(shí)被轉(zhuǎn)換了的單詞的考生，也可以通過(guò)詞根詞綴以及上下文進(jìn)行猜測(cè)。
例如：
Example 1:
One of the brain’s most difficult tasks is to
A. react to their own thoughts
B. helped create language in humans
C. respond instantly to whatever is happening
題干中的核心信息most difficult應(yīng)該在讀題的過(guò)程中被考生捕捉到，在定位時(shí)應(yīng)充分考慮到被代換的可能性;另外備考時(shí)訓(xùn)練充分有素的考生還會(huì)考慮到句子結(jié)構(gòu)的整體順序的不同。這樣，當(dāng)定位到原文的對(duì)應(yīng)信息句：
Making a rapid emotional assessment of the events of the moment is an extremely demanding job for the brain, animal or human.
考生應(yīng)該能夠敏銳地發(fā)現(xiàn)extremely demanding是most difficult的代換，由此確定該句所表達(dá)的意思是正確答案，在list中搜尋正確的選項(xiàng)時(shí)，句子中的內(nèi)容被再一次代換，其中原文中 rapid emotional assessmentof the events被代換為respond instantly to whatever is happening, 至此，答案為C。
Example 2:
It has been suggested thatchildren hold mistaken views about the 'pure' science that they study at school.根據(jù)'pure'定位到文中第二段第一行Many studies have shown that children harbor misconceptions about 'pure' science, curriculum science. 短短一句話我們可以發(fā)現(xiàn)有三組四處同義替換，分別為suggested-shown; hold-harbor; mistaken views-misconceptions; science that they study at school-curriculum science. 因此答案為TRUE。
Example 3:
Some people may believe that the teacher- subjects’ behavior could be explained as a positive survival mechanism.
可以看出句中positive和survival是關(guān)鍵詞，由句中出現(xiàn)的survival mechanism可判斷為是從生物角度來(lái)談?wù)摰�，又因�(yàn)樵牡腇段首句：One’s first inclination might be to argue that there are must be some sort of built in animal aggression instinct that … 中提到了相關(guān)內(nèi)容，所以定位到該段。迅速掃描，搜尋和兩個(gè)關(guān)鍵詞對(duì)應(yīng)的信息，除了在該段第六行出現(xiàn)了原詞重現(xiàn)的survival, 還在上一行出現(xiàn)了advantageous, 顯然是positive的代換。由于原文跟題目中的信息吻合，所以答案是TRUE。
2. 不同詞性的同義替換：
不同詞性同義代換顧名思義，就是在代換時(shí)不受詞性的限制，比如：obvious換成clearly; similar換成resemble等。
Example 1:
Despite substantial funding,results (of this program) have been disappointing.
代換為：This program failed although they received sufficient funding.
因?yàn)榘裠isappointing換成了failed, “although”代換了“in spite of”, 通過(guò)詞的代換就會(huì)很自然的實(shí)現(xiàn)英文中提倡的句式多樣性。
雅思閱讀同義詞轉(zhuǎn)換二——詞組的轉(zhuǎn)換
詞組的轉(zhuǎn)換一般情況下是同義詞轉(zhuǎn)換的一個(gè)衍生。當(dāng)一個(gè)詞無(wú)法用另一個(gè)同義詞到位地解釋時(shí)，可能會(huì)出現(xiàn)用詞組解釋的情況。另外如果本身就是詞組的形式，那么通常來(lái)講還是會(huì)用詞組的形式進(jìn)行解釋。
例如：
Example 1:
原文：Computers are gaining in popularity, despite their cost.
題目：Computers are more popular than they used to be.
原文當(dāng)中的gaining in popularity題目中用more popular than they used to be作為替換。兩者在意思上屬于完全一致的同義轉(zhuǎn)換，因此答案為TRUE。
Example 2:
原文：Biologically, a species becomes extinct when its last individual dies.
題目：In biological terms, aspecies is said to be extinct when only one individual exists.
原文當(dāng)中的biologically用題目的in biological terms作為替換。Become則由is said to be作為替換。但是原文當(dāng)中的die在題目中變成了exist, 直接相反的意思。介于最后這一處的轉(zhuǎn)換與原文信息不符，可以判斷出此題答案是FALSE。
Example 3:
There were several reasons for the research into plastics in the nineteenth century, among them the great advances that had been made in the field of _____and the search for alternatives to natural resources like ivory.
解析：根據(jù)nineteenth century定位到文中第二段......The impetus behind the development of these early plastics was generated by a number of factors- immense technological progress in the domain of chemistry,.......其中，in the field of意思等同于in the domain of“在....領(lǐng)域”，因此答案為chemistry。
In recent years, many of them have been obliged to give up their _____ lifestyle, but they continue to depend mainly on _____ for their food and clothes.
解析：根據(jù)上下文定位到文中 Over the past 40 years, most have abandoned their nomadic ways and settled in the territory's 18 isolated communities, but they still rely heavily on nature to provide food and clothing. 因?yàn)榇蠖鄶?shù)同學(xué)都認(rèn)識(shí)abandon, 更知道give up是“放棄”的意思，屬于單詞與詞組的替換，因此第一個(gè)空填nomadic, lifestyle“ 生活方式”與ways替換，depend mainly on與rely heavily on屬于詞組與詞組的替換，意為“依賴......”，答案為nature。
綜上所述，同義詞替換在雅思閱讀中的重要作用顯而易見(jiàn)。小編提醒廣大考生在平時(shí)一定要注意多積累，比如在背單詞的時(shí)候，就不能只滿足于記住單詞本身，還應(yīng)該多想想這個(gè)單詞有什么同義、近義詞，以及詞組的代換，這樣在雅思閱讀中就能取得好的成績(jī)。