Therearethreekindsofgoals:short-term,medium-rangeandlong-termgoals.Short-termgoalsarethosethatusuallydealwithcurrentactivities,whichwecanapplyonadailybasis.Suchgoalscanbeachievedinaweekorless,ortwoweeks,orpossibly,

　　Therearethreekindsofgoals:short-term,medium-rangeandlong-termgoals.Short-termgoalsarethosethatusuallydealwithcurrentactivities,whichwecanapplyonadailybasis.Suchgoalscanbeachievedinaweekorless,ortwoweeks,orpossibly,months.Itshouldberememberedthatjustasabuildingisnostrongerthanitsfoundation,long-termgoalscannotamounttoverymunchwithouttheachievementofsolidshort-termgoals.Uponcompletingourshort-termgoals,weshoulddatetheoccasionandthenaddnewshort-termgoalsthatwillbuildonthosethathavebeencompleted.Theintermediategoalsbuildonthefoundationoftheshort-termgoals.Theymightdealwithjustonetermofschoolortheentireschoolyear,ortheycouldevenextendforseveralyears.Anytimeyoumoveastepatatime,youshouldneverallowyourselftobecomediscouragedoroverwhelmed.Asyoucompleteeachstep,youwillenforcethebeliefinyourabilitytogrowandsucceed.Andasyourlistofcompletiondatesgrow,yourmotivationanddesirewillincrease.Long-termgoalsmayberelatedtoourdreamsofthefuture.Theymightcoverfiveyearsormore.Lifeisnotastaticthing.Weshouldneverallowalong-termgoaltolimitusorourcourseofaction.Whatisthemainideaofthispassage?______.

　　选项:

　　a、Lifeisadynamicthing

　　b、Weshouldsetuplong-termgoals

　　c、Differentkindsofgoalsinlife

　　d、Thelimitationoflong-termgoals.