问题 单项选择题

关系数据模型通常由3部分组成,它们是

A.数据结构,数据通信,关系操作

B.数据结构,数据操作,数据完整性约束

C.数据通信,数据操作,数据完整性约束

D.数据结构,数据通信,数据完整性约束

答案

参考答案:B

解析: 关系模型由关系数据结构、数据操作和数据完整性约束3部分组成。

阅读理解

任务型阅读。

    Abraham Lincoln said. "All that I am, or hope to be, I owe to my angel mother!" (a)Mothers not only give

us lives and spend their lives taking care of us, they also are our first teachers. 

                                                            

    Write a "love letter" to Mom on Mother's Day. You can change your words on the (1)____________

a lot of times. AIso, she can (2)_____________ your letter over and over again.

    (b)These steps can help you write a warm letter to Mom:

    (d)1.Relax-This "love-letter" is a talk between you and Mom and there are no rules. Even if you make a

mistake, is Mom going to be (3)_____________?

2. Collect Your Thought-Take some time to think about your years growing up.

3. Write from Your Heart-Write your letter as if you were there talking to Mom face

to face. Tell her how much you (4)____________ her. Your "love letter" to Mom on Mother's Day will

make her very (5)____________.

    (c) 金钱决不能买到! It is sure to be cherished (珍爱), saved and read many times over. It is the best

way to (6)___________ your love to Mom!

根据上文,完成下面的任务。

1. 根据短文内容,将下面的的词语填写到短文中(1)-(6)处。

    show,love,happy,letter,angry,read

2. 把(a)处划线句子翻译成汉语。

    ____________________________________________________________________________

3. 完成(b)处划线句子的同义句。 

    These steps can help you write _____________ ______________ warmly.

4. 把(c)处划线句子翻译成英语。

    ____________________________________________________________________________

5. 用(d)处划线句子中的词组改写下列句子。

    Lucy sits behind me.Jim sits in front of me.

    I sit ______________ Lucy ______________ Jim..

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