问题 填空题

关系数据库是采用 【9】 作为数据的组织方式。

答案

参考答案:关系模型

解析:[知识点] 关系数据库的基本概念[评析] 用二维表结构来表示实体以及实体之间联系的模型称为关系模型。关系数据模型是以关系数学理论为基础的,在关系模型中,操作的对象和结果都是二维表,这种二维表就是关系。 关系模型与层次型、网状型的本质区别在于数据描述的一致性,模型概念单一。在关系型数据库中,每一个关系都是一个二维表,无论实体本身还是实体间的联系均用称为”关系”的二维表来表示,使得描述实体的数据本身能够自然地反映它们之间的联系。而传统的层次和网状模型数据库是使用链接指针来存储和体现联系的

完形填空
It happened many years ago, and I was in high school then. Being a student from a 36  family, I had to work on weekends to make some extra money that my family couldn’t really 37   to give me, and one day after work I lost my wallet.
My old car 38  gas in the back. I paid for the gas and then put my wallet on the bumper(保险杠),and drove off. I hadn’t even had time to 39  it when my phone rang and an old man asked me  40  I had lost my wallet. I checked the  41  of my jacket and to my horror, I had. He asked me to tell him how much money was 42  it, and I told him. He then told me where to  43  my wallet.
As I drove into his driveway, I  44  that his car was for the  45 . I was thinking that there was no way this man could 46  get out of hid car and get my wallet off the 47 . He had to pull over, 48 in his wheelchair, lower the lift, and then pick it up, I was  49 .
I knocked on the 50  and he told me to come in. I thanked him like 10 times for 51   my wallet. While I didn’t want to make him angry by offering him 52 , I really felt like offering something. So I asked him if there was anything I could do to repay his 53 , and he said, “Just pass  54  on.” I really wanted to thank him, so I 55  promised I would.
小题1:
A.strangeB.poorC.happyD.small
小题2:
A.decideB.winC.affordD.keep
小题3:
A.threwB.neededC.costD.had
小题4:
A.miss B.take C.openD.share
小题5:
A.whyB.how C.ifD.when
小题6:
A.corners B.partsC.sidesD.pockets
小题7:
A.forB.onC.behindD.in
小题8:
A.pick up B.look for C.think aboutD.set up
小题9:
A.noticedB.saidC.meantD.wrote
小题10:
A.youngB.oldC.disabledD.rich
小题11:
A.sadlyB.easilyC.slowlyD.bravely
小题12:
A.house B.park C.street D.garden
小题13:
A.getB.rush C.pullD.fall
小题14:
A.angryB.pleased C.disappointedD.surprised
小题15:
A.floor B.doorC.boardD.car
小题16:
A.enjoyingB.dislikingC.findingD.hiding
小题17:
A.money B.thanks C.invitationsD.help
小题18:
A.carefulnessB.teaching C.understanding D.kindness
小题19:
A.themB.it C.himD.those
小题20:
A.suddenly B.worriedly C.calmlyD.sincerely
问答题 案例分析题