Reading Selectively Or Extentively

How should we read？Shall we read selectively or extentively？When it comes to discussion，many people have different attitudes towards this problem.

　　Some people are in favor of the opinion that read selectively.Because they consider a man's life is limited，but there a large number of books in the world，it's impossible for us to read all these books in our brief life.For another，the market is filled with a lot of bad books which will do harm to our minds.In short，these people come down to the conclusion that we should read selectively.

　　To the contrary，other people argue that we should read extensively.In their opinions，in the competitive society in order to keep pace with current trend，we must read as many books as possible.Acquiring only a few kinds of knowledge will make the man out of the times.

　　Who's right？As far as I concerned，we should read selectively，especially choose the useful book to read.