Haveyourparentsevercaughtyoumisbehaving--fightingwithpeers，cominghomelateorplayingcomputergameswhenyouweresupposedtobedoingyourhomework？Howdidtheyreact？Didtheytrytotalktoyouorjustyellatyou？

Parentsusedtorelyonphysicalpunishmentslikepushingorspanking（打屁股）tocontroltheirchildren'sbehavior，whichhasbeenproventobeveryharmful．Therefore，mostparentsnowchoosetosimplyyell，thinkingthatlanguageprobablywon'thurtasmuch．Butisthatreallyso？

Usingharshwordssuchas"lazy"or"stupid"toinsultteenagersisjustasharmfulashitting，accordingtoanewstudycarriedoutattheUniversityofPittsburgh，US．"Itcannotreduceorcorrecttheirproblembehavior，"saidProfessorMing-TeWang，leaderofthestudy．"Onthecontrary，itmakesitworse．"

Thestudy'ssubjectswere976two-parentfamilieswithteenagechildren．Researchersaskedthekidsabouttheirbehaviorproblemswhilequestioningparentsabouthowoftentheyhadcursed（咒骂）oryelledattheirkids．

Nearlyhalfoftheparentsadmittedthatthey'dshoutedattheirchildreninthepastyear．Researchersnotedthatthekidswhoseparentsusedmoreharshwordsexperiencedmorebehaviorproblemsafterwards，includingfighting，stealing，lyingaswellassymptomsofdepression（抑郁）．

"Adolescenceisaverysensitiveperiodwhenkidsaretryingtodeveloptheirself-identities．Whenyouyell，itmakesthemfeeltheyarenotcapable，thattheyareworthlessanduseless，"Wangsaid．"Thismayexplainwhysomanyparentssaythatnomatterhowloudtheyshout，theirteenagersdon'tlisten．"

Whileharshyellingcanstopbadbehaviorinthemoment，itdoesn'tteachchildrentobehavehowparentswantthemto．Whatparentsneedtodoispraisetheirchildrenforgoodbehavior．Ifparentsreallyneedtopunishtheirkids，theyshouldtrythingsliketakingawaysmartphonesandremindingthemthatgoodbehaviorwillgetthemback．

67．Whatdoestheunderlinedword"It"inParagraph3referto？___

A．Punishingteenagers．

B．Controllingchildren'sbehavior．

C．Talkingtochildren．

D．Usingharshwords．

68．Wecankn