问题 单项选择题

一个数据库有三个记录类型:(1)供应商,包含唯一的供应商编号、供应商名称和供应商地址;(2)零部件,包含唯一的零部件编号、零部件名称、描述和位置;(3)采购,包含唯一的供应商编号(引用的供应商记录中的供应商编号)、零部件编号(引用的零部件记录中的零部件编号)和数量。这个数据库有()。

A.单一的平面文件结构

B.多层结构

C.关系结构

D.网络结构

答案

参考答案:C

解析:

这个数据库有一个关系结构,因为没有关联,这不是数据本身包含的信息。选项(a)不正确,每个记录类型都与一个平面文件对应,但是这是一个多维结构而不是一个单一的平面文件结构。选项(b)不正确,层次结构应该有一个包含关系的树型结构,而不是明确的数值。选项(d)不正确,网络结构有双向指针,而不是明确的数值。

阅读理解

Wonder why you can get angry so easily while your friend smiles all the time? It’s probably because you both have different personalities(个性).

Personality is also about how people think, behave, and react (反应) to everything around them from day to day.

So what makes people think and behave in certain ways?

Part of the reason is that people are born like this. A baby gets its blood type, genes (基因) and other physical things when it’s still inside its mother. These things may help decide what the baby will be like.

But one’s personality doesn’t stop here. Family life, school learning and life experiences can also make you the person you are. This doesn’t mean it’s impossible to change your personality. You can always try to make yourself better. Don’t get too worried about your shortcomings (缺点). Just accept them. This is a good way to start making changes.

If you don’t know how to make friends, find out why. Is it because you’re too shy? Tell yourself to smile at people. Start talking to people using warm greetings.

Don’t give yourself a hard time about it all. It’s not easy to change lifelong habits in one night. Keep working at it. One day you’ll see that you can turn over a new leaf and be a new you!

小题1:Personality is about the following except        .

A.how you behave

B.what you look like

C.how you react to something

D.how you think about something小题2:We know that         from the passage.

A.people are born the way they’ll always be

B.a person can try to change his/her personality

C.personality decides what a person looks like

D.blood type decides what a person will be like小题3:From the last two paragraphs, we learn that         .

A.a shy person can’t make many friends

B.you can work hard to improve yourself

C.everyone can change him- or herself in life

D.there is no way to change your lifelong habits

名词解释