Today'steenagersatleastintheeyesoftheoldergenerationhavenoreasontobeunhappy.Howeverarecentsurvey（调查）aimingatteenagersin22provincesshowsthat12.97percentofthepeoplequestionedhavesomesortofmentalproblems.Thisoriginatesfromquarrellingwithpeopleorfrompressurewithstudiescausingdepressionconstantworryandfearthesurveysays.
Expertswarnthatmentalproblemsarebecominganincreasinglybiggerthreattoteenagersandhaveresultedinhigherratesofsmokingdrugtakingandover-drinkingamongyouth.
Today'steenagersarefacedwithtougherchallengesinstudyandemployment.Asanonlychildinafamilyyoungpeoplebearhigherexpectationsfromtheirparents.
Livingundersuchgreatpressuremakesteenagerssusceptibletomentalproblems.Ontheotherhandteachersandparentstendtofocustheirattentionsonacademicperformancesbuttakenonoticeoftheirfeelings.
Mentalproblemsifnotaddressedproperlywillgreatlyinfluencethequalityofthecountry'stalent（人才）.Itisestimated（估计）thatbytheyear2020mentalillnesswillincreasetoonefourthofthetotalcasesofillnessfromthepresentonefifth.
Thesurveyshouldringalarmbellstoschoolsandparentsandefficientmeasuresmustbetakentoensurethehealthofourteenagers-bothphysicallyandmentally.
Schoolshouldbuildupacontingent（可能的事件）ofprofessionalpersonneltogivestudentsregularcheckupsandconsultations（咨询）ontheirmentalhealth.
Parentsareencouragedtomakefriendswiththeirchildrensothattheyarewillingtoanddaretosharetheirproblemswithparents.
(1)Theauthor'spurposeinwritingthetextis________.
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A．tosettletheteenagers'mentalproblems
B．toblametheteachersandparentsfortheteenagers'mentalproblem
C．totellusthereasonsfortheproblem
D．toanalyze（分析）theproblemwhichisimportanttoteenagers
(2)Thesurveysaystheteenagershavementalproblemsbecause________.
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A．theirquarrelswithothersorpressurewithstudiescausedepressionconstantworryandfear
B．theirparentsgivetoohighexpectationstothem
C．theirteachersand