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试试看你能找出文章中的主题句吗？Thepandaisapopularanimal.StoriesaboutthepandaintheWashingtonZooarealwaysfrontpagenewsandimportantfeaturesontelevisionnewscast.Stuffedpandasareamongthemostpopulartoysforchildren,andpandapostcardsarealwaysindemandinzoogiftshops.AnnealingAnnealingisawayofmakingmetalsofterbyheatingitandthenlettingitcoolveryslowly.Ifmetalisheatedandthencooledveryquickly,forexamplebydipping(浸)itinwater,itwillbeveryhardbutalsoverybrittle-thatis,itwillbreakeasily.Metalthathasbeenannealedissoftbutdoesnotbreakaseasily.Itispossibletomakemetalashardorassoftasitiswished,byannealingit.Themetalisheated,andallowedtocoolslowlyforacertainlengthoftime.Thelongertheheatedmetaltakestocoolslowly,thesofteritbecomes.Annealingcanalsobeusedonothermaterial,suchasglass.1.Whydopeopleputhotmetalinwater?A.Tomakeithard.B.Tomakeitsoft.C.Tomakeitcool.D.Tomakeitbrittle.2.Inannealing,therequiredhardnessofmetaldependson__.A.thequantityofwaterusedB.thetemperatureofthemetalC.thesoftnessofthemetalD.thetimingoftheoperation3.Assuggestedbythetext,howcanglassbemadelessbrittle?A.Itcanbeheatedandthencooledquickly.B.Itcanbecooledandthenheatedslowly.C.Itcanbeheatedandthencooledslowly.D.Itcanbecooledandthenheatedquickly.Ifyoudon’twantpeopletoknowtoomuchaboutyou，thenyouhadbetterkeepyourfridgecontentssecretaccordingtoaBritishmarketresearchdocumentreleasedlastweek．Researcherspeered(凝视)intothefridgesof400peopleinBritainandcomparedthecontentswiththeowners’lifestyles．Theyclaimtobeabletoclassifythenation’speoplebyfridgecontents．Theysaythosepeoplecanbeseparatedintofivecategories：nutritionnerds(nosocialsense)，foodfaddiest(whatever’sinstyle)，martyrmums，fastfoodfanaticsandrestaurantregulars．Nutritionnerdscaremuchaboutwhattheyputintotheirbodies．Theirfridgesarestockedwithfruit，vegetablesandhealthymeat．Peopleinthiscategorytendtobehighlyorganizedandusuallyworkinlaworaccountancy.Thevastmajorityissingle,butiftheyhaveapartner,thatpersonwillbesimilar.Afridgefullofvitamins—enrichedjuicesimpliesitsownerworksinmediaorfashion．Theytendnottoeatthefoodstheybuy．Knownasthefoodfaddies，theyjustwanttobeseenaspurchasingthelatestimportantthings．Afridgefilledwitheverythingfromsteaktofrozenfishsuggeststhemartyrmum．Herfridgetendstobestockedwitheverykindofproduct，exceptwhatsheherselfwouldwant．Thisfridgehintsatdifficultybalancingfamilyandworklife．Fastfoodfanaticsalwaysbuymineralwaterforsodapop；thenearesttheywillgettofreshfruitistomatosauce．Theirfridgeshintatsomeonewhoworkshardandplayshard．Also，someonewhoisnotintolongtermplanning．Finally，afridgefilledwithnothingmorethanabottleofwhitewineandsomesparklingmineralwaterimpliesanownerwhoissingle，livesinabigcityandenjoysthefinerthingsinlife．Thefridgeisemptybecausethispersonregularlyeatsinrestaurants．1．Wecanknowfromthefirsttwoparagraphsthat___.．A．someresearchersarefondofstaringatotherpeople’sfridgesB．peopledon’swantotherstoknowabouttheirsecretsC．thefoodyouputinthefridgehassomethingtodowithyourpersonality1D．therearemainlyfivekindsoflifestylesamongBritishpeople．2．Accordingtothepassage，peoplewhobelongtofoodfaddies___.A．don’tcaremuchaboutmoneywhenbuyingthingsB．willtrytheirbesttostayhealthyC．oftenstayuplatetofinishtheirjobD．prefertoaskothersaboutwhattodonext3．Whatwillthosewhooftendineoutputinthefridge?A．Allkindsoffoodtheylike．B．Onlysomethingtodrink...