为什么是"Computers are the second most useful invention of the world"为什么是invention

为什么是Computers are the second most useful invention of the world为什么是invention children are t--- how to use computers when they are very young It is 什么common knowledge that computers are super calculators什么是冠词 问一个初三的有关被动语态的英语问题Scientists make computers serve our life better.改为被动语态为什么是Computers are made to serve our lives better by scientists呢?【重点问“are made to serve”,为什么不是“are m 以computers are already widely used in industryanin universities.为开头的完形填空 computers are wonderful machines.(感叹句) _____ _____machines computers are!they didn't go out because of the heavy rain（保持原意）they didn't go out___ it____ heavily. Today computers ______in both cities and towns A.were using B.are used C were used D are using 为 they aren‘t brother and sister,（ ）填反意疑问句 为什么是are there 还是are they?they aren‘t brother and sister,（ ）填反意疑问句 为什么是are there 还是are they?为什么 急 Our teacher could sing very well when she was small.(保持原意) Our teacher __________ ___________ to sing very well when she was small.Computers are wonderful machines.(改为感叹句) _________ _________machines the computers are!They didn’t Are you free now?为什么是Are computers are c____our life,填什么 are these you computers?的回答 T__________ are computers for all the radios they are old computers改为单数形式 Computers are (wide) used in the world those are our computers对our提问 Are there any computers on your desks? They are busy p______ using computers now