A now play such an important part in so many people’s lives that 

                                                       .

Obviously, A has both advantages and disadvantages.

  As is often pointed out, A makes us know                    

                             So that                    

                          . In addition,                  

                         . Yet here again, there is a danger. The

main problem with it is that                                  

                       . It is criticized on the grounds that it contributes (leads to rise in )                                

                                  . Besides (In addition)   

                                        .

  In any case, whether the ultimate of A is good or not, one thing is certain that                                              

                                     . It is the uses to which

it is put that determine its value to society.

1、主题段，总体说明A有利有弊

2、有利的理由之一

3、理由二

4、不利一面

5、理由一

6、具体说明理由一

7、理由二

8、结论