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1.wept2.baggaged3.harden4.5.manufacture6.D7.D8.B9.C10.BTheworld'spopulationcontinuestogrow.Therenowareabout5billionofusonearth.Thefigurecouldreach6billionbytheendofthecenturyand11billioninanother75years.Expertshavelongbeenconcernedaboutsuchagrowth.Wherewillwefindthefood,water,jobs,shelters,schoolsandhealthcareforallthesepeople?2.Amajornewstudyshowsthatthesituationmaybechanging.Alargeandrapiddropintheworld'sbirthratehastakenplaceduringthepast10years.Familiesgenerallyaresmallernowthantheywereafewyearsago.Itishappeninginbothdevelopingandindustrialnations.3.Researcherssaidtheyfoundanumberofreasonsforthis.Moremenandwomenarewaitinglongertogetmarriedandareusingbirthcontroldevicesandmethodstopreventordelaypregnancy①.Morewomenaregoingtoschoolorworkingatjobsawayfromhomeinsteadofhavingchildren.Andmoregovernments,especiallyindevelopingnations,nowsupportfamilyplanningprogramstoreducepopulationgrowth.4.Chinaisoneofthenationsthathavemadegreatprogressinreducingitspopulationgrowth.Chinahasalreadycutitsrateofpopulationgrowthbyaboutonehalfsince1970.5.EachChinesefamilyisnowurgedtohavenomorethanonechild.Andthehopeistoreachazeropopulationgrowthwiththetotalnumberofbirthsequalingthetotalnumberofdeaths,bytheyear2000.6.SeveralnationsinEuropealreadyhavefewerbirthsthandeaths.Expertssaidthatthesenationscouldfaceaseriousshortageofworkersinthefuture.Andthepersonswhoareworkingcouldfacemuchhighertaxestohelpsupportthegrowingnumberofretiredpeople.