Whichoneisthetopicsentence? （1）The19th-centuryAmericanphilosopherHenryDavidThoreauwasfamousforsaying,“Simplify,simplify.”（2）Unfortunately,thetrendthesedaysseemstobe“complicate,complicate”instead.（3）Manypeopleareworkinglongerhours,spendingmoremoney,andgettinginmoredebtthaneverbefore.（4）Theyarealsorelaxinglessandspendinglesstimewithfamilyandfriends.However,thereisalsoacountertrend―atrendtowardvoluntarysimplicity.（5）Peopleinthevoluntarysimplicitymovementtakevariousstepstomaketheirlivesbothsimplerandmoreenjoyable.（6）Somepeopleworkfewhourseachweek.（7）Somemoveclosetotheirworkplacetoavoidalongdailycommute;theywalkorrideabike,instead.（8）Someplantavegetablegarden;thisgivesthemfreshair,exercise,andtimewiththeirfamilies—nottomentionorganicproduce.（9）Butallpeopleinthevoluntarysimplicitymovementtrytocutback—tobuyless;theycutuptheircreditcardsandstopbuyingunnecessaryitems.（10）Inshort,thepriorityinthevoluntarymovementistofollowThoreau’ssuggestion:simplify.