精选优质文档-倾情为你奉上A1. a balanced diet 均衡饮食balance n. 平衡 keep balance 保持平衡on a diet 节食2. a bit 有点,一点后接形容词时相当于a little, 可用于修饰形容词和副词的比较级;3. a bit of 小量 后接名词时用法与a little一样,后接不可数名词4. a crowd of 一群 同义词:a group of5. a long time ago 很早以前ago&before时间段+ago,常与一般过去式连用。before+时间点,也可单独使用,表“以前”。before后可接状语从句,而ago则不能。e.g. Five days ago, I went to the Great Wall. 五年前,我去了长城。 I have never been to there before. 我之前从没去过那儿。 Please wash your hands before you have meals. 饭前要洗手。