高三英语Telephones.ppt

Step 1 Presentation What are they doing? 1 2 3 Introduction Step 2 4 Step 3. Reading Read the passage then find the answers to these questions How was one telephone connected with another in the past? 2.How is one telephone connected with another today? By thick heavy wires. By satellite.(by very thin glass pipes) Listen to the text and Answer the following questions: 1.How does a telephone work? voice(sound wave)→ electrical signals —a pair of lines— electrical signals→sound wave Speaker phone Step 4 listening the receiving Early telephone 3.How about the wires? 4.How to make a call with a handle telephone? not popular (took a long time ) ─ buy,hire ─hear handle telephone →wind (electricity)→ operator→ connect,note 2.Were the earliest telephones popular? 5.When was the first telephone directory printed? 6.And how many telephones in 1877 and in 1990? .telephone ┌ ①USA 1878 directory ├ ②1877 ,2600 └ ③1990 , 300 million Step 5. Retelling the passage 1.work? Speaker phone the receiving phone voice(sound wave) electrical signals a pair of lines electrical signals sound wave 2.early not popular (took a long time) buy, hire hear telephone handle telephone wind (electricity) operator connect difficult 3.telephone directory ①USA 1878 ②1877 ,2600 ③1990 , 300 million 4.telephone equipment advances(electrical signals light signals↓) weaker → (without getting weaker,clear)→instead . 5.How? voice electrical signals light signals electrical signals sound Step.6 Homework Finish off the workbook exercises Try to retell the passage ； 英超比分 / 英超比分 ； 原来血脉の壹半左右,这实在是太不值了.根汉也欣慰の笑道：你小子能这样醒悟倒也不枉咱收你坐咱座骑,血脉再强又如何,那都是借祖先の庇佑,或许你这壹辈子都无法超越祖先の高度.而咱们,要做就要做自己,比祖先,都要强大若是没有这种意志,还在修行界混什么混,早晚会被人给淘汰の.恩,老大说の对,所以咱才没有吞食小红,而是决定娶小红为妻了.白狼马笑道.娶她为妻?根汉有些意外,咧嘴笑道：什么时候办喜酒呀?不用了老大,酒就不用摆了,咱们简单の吃个饭,弄个仪式就算是成亲了.兽修之间嘛,