题目内容
创建完成的表，也可以为某个字段创建唯一索引
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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。
Complete the passage with words chosen from the Words and Phrases to Drill Box. Change the form where necessary,JimDohertymaynotbeabornfarmer,buthe (1)withouttoomuchtrouble.Notthathehashaditeasy.Thatfirsthard winterhefacedmusthavelefthimwiththe(2)togive upandgobacktothecity.Buthemanagedto (3) itwithoutlosingheart.He'spickedupalotofskillssincethenandmade somereal(4)tohisfarm,thoughwithoutmuch laborsavingmachinery, (5)thatoldrotary cultivator.I (6) hedoesn'tmakeallthatmuch,thoughhedoeshavehiswritingto(7) whatlittle (8)hemakesfromthefarm.I guesshedoesitprimarilyforthequality of life.Certainly,theyseemahappyfamilyandyoucanoftenseethemout working together,onedayspayingappletrees, thenext (9) fire wood,
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