![Population expansion作文]( "Population expansion作文")
- Populationexpansionisoneofthemostseriousproblemsintheworld.Withbetterhygienicconditionsandbettermedicalcare,fewerbabiesdietoday.Butthebirthrateremainsunchanged.Moreover,thedeathratehasbeenloweredconsiderablybyvariouskindsofprogress.Peoplegenerallyliv...
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