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1、必修二必修二必修二必修二Unit 4Unit 4Words&expressionExpressions:1.decreasein 2.decreaseto3.decreaseby在在方面减少方面减少减少到减少到减少了减少了我们班人数减少到我们班人数减少到55/减少了减少了2人。人。The number of students in our class decreased to 55/by 2.2.die out(家族、物种、习惯风俗、火家族、物种、习惯风俗、火)灭绝灭绝 die off(家族、物种家族、物种)相继灭亡，相继灭亡，(草木草木)先后枯先后枯死死 die of 因因而死而死(情感、疾
2、病、寒冷、饥饿等情感、疾病、寒冷、饥饿等内因内因)die from 因因而死而死(刀伤、枪伤等外因刀伤、枪伤等外因)Many old customs are gradually dying out.The leaves of the tree are dying off.3.in danger处于危险中处于危险中The man is in danger.4.in relief如释重负如释重负We were in relief when he was out of danger.5.have mercy on 对对表示怜悯表示怜悯 show mercy to sb.同情某人同情某人 withou
3、t mercy 残忍地残忍地 in danger of处于处于的危险中的危险中The man is in danger of losing his sight(失明失明).7.pay attention to 注意注意Pay attention to your attitude!8.burst into laughter突然笑起来突然笑起来She burst in to laughter when she heard the joke.6.protectfrom 保持保持不受不受(伤害伤害)He wore sunglasses to protect his eyes from the sunlight.Please arrange the books according to size.根据根据11.so thatHe got up late so that he was late for school.10.according to以至于，结果以至于，结果e into being产生、形成产生、形成Do you know when the new government came into being?请按大小将书分类。请按大小将书分类。他起床晚以至于上学迟到。他起床晚以至于上学迟到。