3．I offered to give them a lift, but they declined (谢绝)．

　　4．The fans screamed (尖叫) with excitement when they saw him.

　　5．I took the liberty (自由) of borrowing your dictionary while you were absent.

　　6．Jazz has its roots (起源) in the folk songs of the southern states of the US.

　　7．I'd like to change the format (形式) of the meeting a little.

　　Ⅱ.拓展词汇

　　1．slavery n．奴隶身份；奴隶制→slave n．奴隶→slaver n．奴隶贩子

　　2．tendency n．倾向，偏好；趋势，趋向→tend v．倾向；趋向

　　3．gradual adj.逐渐的，逐步的；平缓的，不陡的→gradually adv.逐渐地；逐步地

　　4．prejudice n．偏见，成见 vt.使怀有(或形成)偏见→prejudiced adj.有偏见的；有成见的；偏颇的；偏心的

　　5．discrimination n．歧视，区别对待；辨别力，鉴赏力→discriminate v．辨别，区分；歧视→discriminating adj.有辨别力的；有识别力的；有鉴赏力的

　　[巧记单词]

派生词 gradually →gradual＋­ly discrimination →discriminate去e＋­ion 　　Ⅲ.补全短语

　　1．spring up　　　　　　　突然兴起，迅速出现

　　2．combine ...with 把......与......结合

　　3．turn to 转向，求助于

　　4．be recognized as ... 被认为是......

　　5．lead to ... 导致

　　6．bring back 带回

　　7．turn out 结果是

　　8．break up 破裂，解散，破碎

1．[教材原句]While the blues was popular, as a musical format it lacked variety