Readthefollowingparagraphsandidentifythesentencethatisnotappropriateineachoftheparagraphs.阅读以下段落，选出每一段中不合适的句子删除。 (1)Japanesesocietyisfacingitsmostseriousthreatinrecentyears.(2)Japan’sbirthratekeepsfallingsteadily.(3)Japanesewomenfindithardertohuntforasatisfactoryjob.(4)Ifthiscontinues,thepopulationwillgetsmallerandsmaller.(5)Whilethenumberofbabiesisdecreasing,theaverageJapaneselifespanisincreasing.(6)Itisoneofthelongestintheworld.(7)Thisisanationalcatastrophebecausetherearefewerworking-agepeoplewhopayintothesocialsecuritysystem,andtherewilleventuallybetoofewworkers.