Book2 Unit 4 学案教师版Warming up Language points【原句】1. If their habitat is threatened or they cannot find enough food, their numbers may ____________.(P25)如果它们的栖息地受到威胁或者它们不能找到足够的食物，那么它们的数量也许会减少。__________vt./vi 减少，变小Eg: We have decreased our demand for paper. 我们已减少了用纸的需求。Population growth is decreasing by 1.4% every year. 人口增长每年减少了1.4%。The population decreased to 1 million last year. 人口去年减少到 1 百万。As we all know, the price of petrol has increased recently. 众所周知,最近油价已增长了。归纳：___________下降/减少了…. _____________减少到…. ___________增加/长, 提高 (1)这将会减少我们的费用（cost）。_____________________________________________(2)去年，公司的数量下降了 2%。___________________________________________________(3)如今，广告的数量正在快速地增加。（rapidly）______________________________________decrease ,decrease by, decrease to , increase ,This will decrease our cost. The number of firms decreased by 2% last year.Nowadays, the number of ads is increasing rapidly.【原句】2. As a result these endangered animals may even ___________ . 结果,这些濒危动物甚至可能会灭绝。(P25)___________灭亡，逐渐消失Eg: Many wild animals have died out in the past few years. 许多野生动物在过去几年灭绝了。Nowadays many people die of cancer. 现在有很多人死于癌症。 He died from drinking/smoking/overwork. 他死于饮酒/吸烟/过度工作。 Lily was dying to get a Christmas gift. = Lily was dying for a Christmas gift. Lily 渴望得到一份圣诞礼物。 搭配：____________死于(饥饿；疾病) _______________死于(外界引起的)__________________________________________渴望得到…….(1)Many old customs are _________ ( 逐 渐 消 失 ) because of the influences of foreign festivals.(2)A great number of people _________ (死于) the earthquake which broke out at midnig...
