was designed many years ago，with a goal in mind：transmitting the human voice in a more-or-less recognizable form．

A．DWDM

B．PSTN

C．internet

D．WLAN

[单选题]F．or many years, the principle goal of computer(73)was to write short pieces of code that would execute quickly. The(74)needed to be small, because memory was expensive, and it needed to be fast, because processing power was also expensive.A．usersB．p

[试题]Manyyearsago，alotoffactorieswere_______frombigcitiestothemountainousareasincaseofwar.A.transferredB.transformedC.transmittedD.transported

I wonder how many years ago ______.( )A. did your father retireB. your father r

It was ________ small village many years ago.A. a；theB. the；aC. 不填；不填D. the；the

I wonder how many years ago ________.A. did your father retireB. your father was

Many years ago, the girl ( ) in London with her family for a long time.A. livedB

[单选题]Social customs and ways of behaving are changing.（ 1 ） was considered impol

[单选题]Social customs and ways of behaving are changing.（ 1 ） was considered impol

[单选题]Social customs and ways of behaving are changing.（ 1 ） was considered impol

[单选题]Social customs and ways of behaving are changing.（ 1 ） was considered impol