新概念英语二Lesson21——Mad or not课件

Lesson 21 Mad or not decibel ['desɪbel] 20-30db 70db 90db 110db 125db 130db 139db 190db 190分贝 导致死亡 140分贝 欧盟界定的导致听力完全损害的最高临界点 139分贝 世界杯球迷的呐喊声 130分贝 火箭发射的声音 125分贝 喷气式飞机起飞的声音 120分贝 在这种环境下呆超过一分钟即会产生暂时耳聋 110分贝 螺旋浆飞机起飞声音、摇滚音乐会的声音 105分贝 永久损害听觉 100分贝 气压钻机声音、压缩铁锤捶打重物的声音 90 分贝 嘈杂酒吧环境声音、电动锯锯木头的声音 85 分贝 及以下不会破坏耳蜗内的细胞 80 分贝 嘈杂的办公室、高速公路上的声音 75 分贝 人体耳朵舒适度上限 70 分贝 街道环境声音 50 分贝 正常交谈声音 20 分贝 窃窃私语 decibel ['desɪbel] New Words of L21 mad [mæd] adj.发疯的 reason ['riːz(ə)n] n.理由 sum [sʌm] n.量 determined [dɪ'tɜːmɪnd] adj.下定决心的 Summary Writing（L21） Is the writer slowly going mad or not? The writer is slowly going mad. Where does he live? He lives near an airport. What can be heard night and day? Passing planes can be heard night and day. Have most of his neighbours left their homes or not? Most of his neighbours have left their homes. Summary Writing（L21） Has he been offered money to leave or not? He has been offered money to leave. What is he determined to do? He determined to stay here. What does everyone say? Everyone says he must be mad. Are they probably right or wrong? They are probably right. Mad or not? 1.Aeroplanes are slowly driving me mad. mad=crazy 2.I live near an airport and passing planes can be heard night and day. 3.The airport was built years ago, but for some reason it could not be used then. 4.Last year, however, it came into use. 开始启用. 词性转换 reason=cause Mad or not? 5.Over a hundred people must have been driven away from their homes by the noise. 6.I am one of the few people left. 7.Sometimes I think this house will be knocked down by a passing plane. home有感情色彩，house没有 Mad or not? 8.I have been offered a large sum of money to go away，but I am determined to stay here. sum=amount 同义词：give/provide offer/give sb sth（提供某人某物）offer/give sth to sb（提供某事给某人） provide sb with sth/provide sth for sb. 1.一般现在时的被动语态： am/is/are +V过分 2.一般过去时的被动语态：was/were +V过分 3.一般将来时的被动语态：will be + V过去 4.现在进行时的被动语态：am/is/are +being +V过分 5.过去进行时的被动