根据短文，回答下列各题。 Most of you graduating today will be employees all your working life，working for some．body else and for a paycheck．And SO will most，___21___ not all，of the thousands of other youngAmericans graduating this year in all the other school and colleges across the country． ___22___has become a society of employees．A hundred years or so ago only one 23 everyfive Americans all work was employed,i．e．，worked for somebody,else．Today only 20％of A．mericans are not employed but working for themselves．And ___24___ fifty years a90“being em—ployed”meant___25___as a factory laborer or as a farm hand，the employee of today is increasing—ly a middle-class person with a ___26___ formal education，holding a professional or managementjob requiting___27___and technical skills．___28___，two things have characterized American socie．ty during these last fifty years：the middle and upper classes have become employees；and middle—class and___29___employees have been the fastest growing groups in our working population．grow-ing SO fast that the industrial worker，that ___30___ child of the Industrial Revolution．has beenlosing in numerical importance ___31___the expansion of industrial production． This is one of the most profound social changes any country ___32___．It is，however，a per-haps ___33___ 9reater change for the individual young man___34___to start．Whatever he does，inau____35__，he will do it as an employee；wherever he aims，he will have to try to reach it___36___being an employee． As an employee you work with and through other people．This means that your success asan employee will ___37___ 0n your ability to communicate with people and to present your ownthoughts and ideas to them ___38___ they will both understand what you are driving ___39___ and．be persuaded．The letter，the report or memorandum(记录)，the ___40___ spoken“presentation”to a committee are basic tools of the employee． 第21题答案为：

A. but
B. if
C. nearly
D. fortunately