Lesson 21 Fun at the zooKnowledge points:1. Have you ever been to the zoo2.The zoo is open.3.They go through the entrance to 4.sign (n) 标志 （v）签名，做手势5.danger:(n) dangerous (adj) safe (adj) 安全的 safety (n) 安全 in danger out of danger 脱离危险6No photos ！ No parking No smoking take photos7.surprise (n) (V) in surprise 吃惊地 to ones surprise 8.mad : (adj) make sb mad 使某人 发疯 be mad + to do doing 介词短语 be mad at with sb at for s h 因为某事和 某人发疯或发怒be mad about on for 对痴迷狂热eg: He went mad with joy.9.almost nearly Almost 与 nearly 同义 ，但 almost后加否定意义的词：no ,nothing, none,never 等，而且修饰 any,以及由 no any 构成的合成词，还可修饰 more than 和 too.nearly: 有色彩不可以和否定意义的词连用。但和 not 连用 not nearly 远远不够，在具体数字前一般用 nearly 并且 nearly 前可用 very pretty 修饰Eg: Thats almost too muchIts not nearly so easy as you think.10.He doesnt know its spring.11. all winter 12.make sb do adj p.p 介词短语 be made to do sth make it 成功13.wake up 14. Dont forget what the sign said.15.Me too . Me neither 16.exit 17.Thats where we go out .