阅读理解
Someproblemsaredifficulttosolve!Buttherearealotofnumberexpressionsthatcanhelp．Forexampleifweputtwoandtwotogetherwemightcomeupwiththerightanswer．Weknowthattwoheadsarebetterthanone．Itisalwaysbettertoworkwithanotherpersontosolveaproblem．
Sometimeswecankilltwobirdswithonestone．Thatiswecancompletetwogoalswithonlyoneeffortoraction．Butwemustrememberthattwowrongsdon'tmakearight．Ifsomeonedoessomethingbadtoyouyoushouldnotdothesametohim．
Ifyouaregoingoutwithyourgirlfriendorboyfriendyoudonotwantanotherfriendtogoalongonyourdate．Youcanjustsaytoyourfriend：twoscompanythree'sacrowd．
AyoungchildinschoolhastolearnthethreeRs．Theseimportantskillsarereadingwritingandarithmetic．Thesethreewordsdonotallstartwiththe1etterRbuttheyhavethesoundofR．Teacherswillgivethreecheerswhentheirpupilsdoagoodjob．
Someofmyfriendswereconfusedanddidnotunderstandtheirschoolwork．Theywereatsixesandsevens．Infacttheydidnotcarewhethertheycouldfinishhighschool．Theysaw1ittledifferencebetweenthetwochoices．Buttheywerereallyhappywhentheycompletedtheirstudiesandgraduatedfromhighschool．Theywereinseventhheaven．Theywereoncloudnine．
Lastyearoneofmyfriendsappliedforabetterjobatheroffice．Ididnotthinkshewouldgetit．Ithoughtshehadahundredtooneshotatthejob．Otherpeopleatherofficethoughtherchanceswereamilliontoone．Onereasonwasthatshehadbeencaughtcatchingfortywinks(打盹)attheoffice．Shesleptatherdeskforshortperiodsduringtheday．Buthersupervisorappointedhertothenewjobattheeleventhhour－attheverylastminute．Iguessherluckynumbercameup．
(1)
A．
Howtosolvethedifficultproblems．
B．
Differencesbe