题目

下列实数中，无理数是（ ）A. B. C. D. 答案：【答案】A【解析】根据无理数的三种形式求解．为无理数，，0，0.2020020002为有理数．故选A．         阅读下面短文，从短文后所给各题的四个选项中选出能填入相应空白处的最佳选项。      Scientists find that hard-working people live longer than average men and women．Career women are ___1___ than housewives．Evidence shows that ___2___ are in poorer health than the job-holders．A study shows ___3___ the unemployment rate increases by 1%, the death rate increases correspondingly（相应的） by 2%．All this ___4___ one point: Work is helpful to health．        Why is work good for health? It is because work keeps people busy, _5__ loneliness and solitude．Researches show that people feel __6__ and lonely when they have nothing to do．Instead, the happiest are those who are ___7___．Many high achievers who love their careers feel that they are happiest when they are working hard．Work serves as __8___ between man and reality．By work, people ___9___ each other．By collective activity, they find friendship and warmth．This is helpful to health．The loss of  work _10__ the loss of everything．It affects man spiritually and makes him liable to （易于）___11__．        __12___, work gives one a sense of fulfillment and a sense of ___13___．Work makes one feel his value and status in society．When ___14_ finishes his writing or a doctor successfully __15___ a patient or a teacher sees his students ___16___, they are happy __17___．        From the above we can come to the conclusion ___18___ the more you work, __19___ you will be．Let us work hard, __20__ and live a happy and healthy life． 1.A．more healthier          B．healthier             C．weaker               D．worse 2.A．career women        B．the busy             C．the jobless          D．the hard-working 3.A．whenever                B．whether              C．though                D．since 4.A．comes down to       B．equals to              C．adds up to          D．amounts to 5.A．on                        B．at                       C．in                       D．away from 6.A．interested              B．joyful              C．unhappy              D．worried 7.A．busy                       B．free                     C．lazy                                           D．empty 8.A．a river                     B．a gap                C．a channel             D．a bridge 9.A．come across                                         B．come into contact with        C．look down upon                                  D．watch over 10.A．means                   B．stands                 C．equals                 D．matches 11.A．success                 B．death                                              C．victory                     D．disease 12.A．Besides                  B．Nevertheless       C．However             D．Yet 13.A．disappointment       B．achievement         C．regret                  D．apology 14.A．a worker                B．a farmer             C．a writer               D．a manager 15.A．manages                B．controls               C．operates on          D． deals 16.A．raise                      B．grow                   C．rise                   D．increase 17.A．in a word               B．without a word    C．at a word            D．beyond words 18.A．that                       B．which                C．what                                         D．不填． 19.A．the lonelier and weaker                         B．lonelier and weaker        C．happier and healthier                          D．the happier and healthier 20.A．study well              B．studying well       C．study good          D．studying good