题目内容
普通索引允许被索引的数据列包含重复的值
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创建完成的表，也可以为某个字段创建唯一索引
删除视图中的数据，基本表中的数据也同样被删除。
Readthepassegecarefully until you havegotits mainidea,andthenselectoneappropriateword for eachgapfromthebox followingthepassage.Ahomesteader(自耕农 )isapersonwholivesaself-reliantlifestyle withmajoremphasisonhomeproduction.WhiletheIndustrialAgeis being(1)by information andelectronics,somepeople trytoseekanescapefromthesocial,environmental,andeconomicmadnessofthemodernageandbeginto(2)returningtothe country.Asthislifestyleissoenjoyable,satisfyingandrewarding,more andmorepeoplearepreparedto (3)theirjobinthecityand startanewandmoremeaningfullifeontheirvariousfarms.Forsomeit hasbecomenotonlyawayoflife, butalsoawayof looking at the (4).Ofcourse,lifeinthecountrycanbepretty(5).While itisan enjoymentto besoclosetoNature, youmayhavetoreduceyour dependenceon (6)bycuttingbackonyourdailyconsumption.Youmayalsohavetocookyourownmealseverydayand (7) yourownlow-costentertainmentwithoutthe(8)that arecommonincities.On(9) ,however,livinginthecountry haslongbeenapartoftheAmericanDream.GenerationsofAmericanshaveconsideredthecountryan(10) settinginwhichtolive andraiseafamily.considercreativeworldfuelsluxuriesoccasionsidealappliedreplacedinitialquittoughprovideassistbalance
对于生产性的建筑，根据其使用性质，通常可以分为（）建筑、（）建筑和农用建筑。
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