同义替换是四六级考试中最常见的考试形式，不仅考察了同学们对单个单词、词组之间的记忆，更考核了同学们对单词、词组之间的联系的理解。新东方在线四六级教研室为此总结了真题中出现过的高频同义替换，帮助同学们更好地完成考试。

　　在写作中，运用过多的简单词无法提高作文的分数，因此新东方在线四六级建议考生们适当地用一些相对高级一些的词汇，提高作文的可读性。

　　一、guess 假设，猜想

　　1.hypothesis [haɪˈpɒθəsɪs]

　　Their hypothesis is that watching excessive amounts of television reduces a person's ability to concentrate.

　　他们的假说认为过度观看电视会导致注意力不集中等问题。

　　2.speculation [ˌspekjuˈleɪʃn]

　　The book is just a lot of idle speculation about the future.

　　这本书就是很多关于未来的无意义的猜想。

　　3.assumption [əˈsʌmpʃn]

　　Her plan is based on the underlying assumption that the economy will improve in the near future.

　　她的计划是基于这样一个假设：经济将在不久的将来会有所改善。

　　二、suggestion 提议

　　1.proposal [prəˈpəʊzl]

　　This proposal would be a less restrictive way of obtaining the same information.

　　该提议是以相对宽松的方式获取同等信息。

　　2.recommendation[ˌrekəmenˈdeɪʃn]

　　The president, according to a White House statement last week, has decided to accept our recommendation.

　　白宫发言人上周表示总统已经决定接受我们的提议。

　　3. proposition[ˌprɒpəˈzɪʃn]

　　Right now, a significant minority (some 40 percent) of African-American voters already agrees with that proposition.

　　现在，少数非洲裔美国选民(将近40%)已经同意了该提议。

　　三、motivation 动机，动力

　　1.impetus[ˈɪmpɪtəs]

　　This is the primary impetus behind the economic recovery.

　　这是促使经济复苏的主要动力。

　　2. momentum [məˈmentəm]

　　They are each anxious to maintain the momentum of the search for a solution.

　　他们每个人都迫切希望能一直劲头十足地去寻求解决方案。

　　3. incentive [ɪnˈsentɪv]

　　She had not only the incentive, but the necessary opportunity.

　　她不但有动力，还有必要的机会。

　　4. encouragement [ɪnˈkʌrɪdʒmənt]

　　He's so invested in this dream of becoming a writer that any encouragements ends him flying.

　　他为实现作家梦付出了很大的心血，任何鼓励都让他非常高兴。

　　四、evaluation 评估，估计

　　1. assessment [əˈsesmənt]

　　This was an uncharitable assessment of the reasons for the failure.

　　这是对失败原因毫不讲情面的分析评估。

　　2.appraisal [əˈpreɪzl]

　　What is needed in such cases is a calm appraisal of the situation.

　　在此类情况下需要对形势有一个冷静的评估。

　　3.estimate[ˈestɪmət]

　　At least one estimate puts the total tab at $7 million.

　　至少有一个估价把总数定在了700万美元。

　　4.judgment[ˈdʒʌdʒmənt]

　　Our judgment as to the cause of his failure must rest on the evidence.

　　我们对他失败的原因评判应当基于证据。

　　五、disorder 混乱

　　1. disorganization[dɪsˌɔ:ɡənaɪ'zeɪʃn]

　　Maybe this is just another manifestation of Democratic disorganization.

　　也许这又一次彰显了民主混乱。

　　2. chaos[ˈkeɪɒs]

　　Whatever troubles arise, we'll have peace of mind amidst seeming chaos.

　　无论出现什么样的麻烦，我们都会在貌似混乱的情形中保持平和的心态。

　　3.turbulence[ˈtɜ:bjələns]

　　The world situation is characterized by turbulence and intranquility.

　　世界局势动荡不安。

　　4.turmoil [ˈtɜ:mɔɪl]

　　My emotional turmoil had drained me.

　　纷乱的情绪让我心力交瘁。