23. go back over centuries追溯几个世纪以前

24. come to a sad part讲述一段伤心的事情

25. play the role of扮演……的角色

He is good at playing the part of Maozedong

二、学海导航

单元难点疑点思路明晰

1. Born a free man，he was now in chains . 他生来就是个自由人，现在却戴上了镣铐。

〖明晰〗(1) Born a free man为过去分词短语作状语，相当于一个让步状语从句的省略。完整句子为：Although he was born a free man . 再如：Beaten black and blue，he didn‘t go down on his knees . 虽然被打得遍体鳞伤，他仍不屈膝投降。

(2) in chains / irons 戴着镣铐;在囚禁中。如：

He was in chains and disgrace . 他被囚而受辱。

All the murderers in chains will soon be sentenced to death . 所有戴着镣铐的凶手很快就要被判处死刑。

已学过的由“in + 名词的复数”的介词短语如：

in pairs 成双地 / in circles 围成圆圈形 / in tears 哭着

One man had a head wound and was in pain . 一个人头部受伤，非常疼痛。

had a head wound=be wounded in the head

in pain 疼痛难忍。已学过的由“ in +名词的单数”的介词短语， 如： in public公开地 /in silence无声地 / in battle 在战斗中…

2. What was to become of them all，he wondered .他感到纳闷，他们的下场将会怎样呢?

〖明晰〗(1) become of (人或事物的)结果是;使遭遇。如：What will become of her now that her husband has died ? 她丈夫一死，真不知她的遭遇将如何。

What has become of the book I put here yesterday ?我昨天放在这儿的书哪去啦?

(2) he wondered 置于句尾作插入语，意思是“他想知道”。

3. Worse was to come.更糟的事就要发生了。

〖明晰〗worse adj. (bad的比较级)更坏的、更差的、更恶化的。常用句式有：to make the matter worse (=and what is worse 或worse than all更糟的是。worse在本课作名词“更坏的事”，如：I have worse to tell. 我还有更坏的事要说。 Worse cannot happen.事情不可能更坏了。

4. They had rough weather, and Kunta’s back bled from rolling over on the hard wooden boards . 途中天气非常恶劣，由于在硬木板上滚来滚去，昆塔的背流出了血。