computer got his new transistors.Its size was totally changes at that time.And in the early 1960s，the first family of computers were connected to each other.In 1970s，computers have brought into people's homes.Now computers have been used by billions of people to deal with information and communicate with each other around the world by the Internet.

　　T：Congratulations!You've done very well.Now try to do the same to your partners，OK!

　　Step 2 Words and Expressions

　　Task 1

　　T：Please turn to Page 20 and finish Discovering useful words and expressions.At first，look at Ex.1.From the reading passage，find the words and expressions with the following meanings.Now，ten students will be asked to give the words.Who can?Volunteers!

　　Check the answers together.

　　Task 2

　　T：Well done.Now please look at Ex 2. and complete the passage with some of the words above.Pay attention to the use and the forms of those words.

　　Task 3

　　T：Please finish Ex.3.Look at the sentences on Page 20.Tick the right word.Then some of you will be asked to read the sentences one by one.

　　Task 4

　　T：Please turn to Page 56 and let's finish Using Words and Expressions.First look at Ex.1.Read through the words in the right-hand box below.Use some of them to name each part of a computer in the left-hand box.We have known about computer.But who can give us the exact names?

　　Task 5

　　T：Now please look at Ex.2.Complete the sentences with some of the words in the right-hand box above.You can use each word only once.First do the exercise individually，and then check your answers with your partners.And last seven students will be asked to report their answers to the class.

　　Step 3 Grammar-The Present Perfect

　　Passive Voice

T：Boys and girls，now please pay attention to the following sentences in the text：