题目内容：
根据以下材料回答题 8:30P．M．
Outlook
Outlookisbackwithanewseriesofreportstokeepyouupdatewithallthat'snewintheworldofentertainment．Storiesgoallthewayfromthetechnicaltotheromantic,fromstagetoscreen．Therewillbereportsofthestarsofthemoment,thestarsofthefutureandthestarsofthepast．Thedirectorwithhisnewfilm,thedesignerwiththelatestfashion,andthemusicianwiththepopularsongarepartofthenewOutlook．TheprogramisintroducedbyFranLevine．
9:00P．M．
Discovery
Whena10-year-oldboygetsafirst-classdegreeinmathematicsoran8-year-oldplayschesslikeafuturegrandmaster,theyareconsideredasgeniuses．Wheredoesthequalityofgeniusescomefrom?Isitallinthegenesorcananychildbeturnedintoagenius?Andifparentsdohaveachildwhomightbecomeageniusinthefuture,whatshouldtheydo?Inthis30-minutefilm,BarryJohnson,theprofessoratSchoolofMedicine,NewYorkUniversitywillhelpyoudiscoverthean-swer．
10:00P．M．
Science&Health
Isitpossibletobeathighbloodpressurewithoutdrugs?Theansweris"yes",accordingtotheresearchersatJchnsHopkingandthreeothermedicalcentres．Afterastudyof800personswithhighbloodpressure,theyfoundthatafter6monthsthosedevotedtoweightloss--exerciseandeatingalow-salt,low-fatfood--lostabout13poundsandbecamefitter．Plus,35%ofthemdroppedintothe"normal"category(范畴)．Thisweek,Dr．AlanDuckworthwilltellyouhowthesepeoplereducetheirbloodpressuretoalevelsimilartowhat'sachievedwithHypertensiondrugs．
Themainpurposeofwritingthesethreetextsis__________． A．toinvitepeopletoseefilms
B．toinvitepeopletotopicdiscussions
C．toattractmorestudentstoattendlectures
D．toattractmorepeopletowatchTVprograms
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