一、引出开头1:I t i s well-k nown t o us that……(我们都知道……)==As far a s m y k no wle dg e i s conc e rned, …( 就我所知…)ﻫ2:R e c e n tl y t he pr o blem of…… h as b ee n b roug h t into focus、 ==Nowad a ys t here is a growin g concer n o ver ……(最近……问题引起了关注)3:Nowa d ays(o ver p o p ula t i o n)has b ee a p robl em we have t o face、(现今,人口过剩已成为我们不得不面对得问题)4:I nt erne t has b e e n p l a yi n g a n i n creas i ng ly i m p ortan t role in our day—t o—day li fe、 It h a s b r ou g h t a lot o f b e nefi t s bu t has c re ated s o me serio u s pr o blem s as well、(互联网已在我们得生活扮演着越来越重要得角色,它给我们带来了许多好处但也产生了一些严重得问题)5:With t h e r a pid d evelop m e n t o f science and techno l o g y,mo r e and mo r e peo pl e believe tha t……(随着科技得迅速进展,越来越多得人认为……)6:I t is a mon beli e f th a t……==It is monl y beli eved that……(人们一般认为……