问题 单项选择题

在数字字段输入“>0”表示______;要求用户输入一个以L开头且长度不限的字符串应该表示为______。请选出正确的对应选项( )。

A.前者表示所有值均为正数,后者填写Like“L*”

B.前者表示所有值均非负,后者填写Like“L”

C.前者表示所有值均为正数,后者填写Like“L”

D.前者表示所有值均非负,后者填写Like“L,”

答案

参考答案:A

解析: 本题旨在考查字段属性中的有效性规则的掌握情况。字段属性中的有效性规则是为了检查字段中的某个值是否有效,可以在该字段的“有效性规则”属性框中输入一个表达式,只有满足该表达式才能将其输入到该字段内,反之,则无法对其进行输入。这里只使用了“>”,“>0”表示要求输入的数是正数,由于没有等号所以不包括零。Like“L”表示的是以L开头且长度为3的字符串。答案B前后两个分句都有错误。前面说非负,包含了零与题意违背;后面混淆了“”与“*”的含义。“*”才表示任意个任意字符。由对答案B的分析可知答案C错在了后面不限长度的地方。答案D的错误也显而易见,不能包含零。答案为A。

阅读理解与欣赏
阅读理解

阅读理解。

To all of you at Chinese love links,

     I am 44 years old and never married. I have always wanted to find that perfect someone that I dream

about. For about the last five years I have almost given up the hope of ever finding the one I truly wish to

spend the rest of my life with.

     I have always tried to be a nice guy. I had found your website some four or five months before. I did

not know what to expect. I don't know how to speak Chinese and never thought truly of how I was to an

Asian woman.

     Well, I had a lot of replies from some very nice and pretty women. I had a hard time finding only a couple

to write to. But one stood out from the rest. She was cute, nice and seemed to hold a lot of the same values

as I do. In a short time I had decided to write only to her. We communicated via emails 2-3 times a day and

phone calls once or twice a week.

     I went and met her and her family only a week ago. Her name is Ying and she lives in Nanning. I found

Nanning to be one of the most beautiful cities I had ever been to. We had even decided to marry and to bring

her to the USA under the fiancée visa. Not only did she meet everything I had ever hoped to find in someone

else but turned out to be what every woman should be like, at least the ones I have met. We plan to marry as

soon as she is here and start a family together as neither of us has children but we both want them.

     So to anyone out there reading this, I can only say this: You may not find what you are looking for if

you're not honest with your partner and yourself. This site worked for me mostly because I was honest with

something that I wanted in someone else. When I did find her, love can work even across the other side of

the world, between language differences and cultural differences. I wish you all luck in finding your perfect

match. I have finally found mine and wish to give all my thanks to those at Chinese love links to help make it

happen.

                                                                                                                                    Sincerely yours,

                                                                                                                                    Arthur

1. We can infer from the letter that Chinese love links is a website to _____.

A. help foreigners to travel in China

B. help both Chinese and foreigners to find one they want to marry

C. help Chinese and foreigners make friends

D. receive letters from the USA

2. Which of the following is true about Arthur's story?

A. He was sure of finding a Chinese woman as his wife at first.

B. He was determined to find a Chinese woman as his wife.

C. He almost lost hope in finding a perfect wife until he found Ying.

D. No women wrote to him before Ying.

3. Ying stood out from the rest because _____.

A. she was a Chinese

B. she had much in common with Arthur

C. other women stopped writing to Arthur

D. she was cute and nice and often phoned to Arthur

4. Arthur thinks _____ is the most important in finding someone one wants to marry.

A. being honest with the partner and oneself

B. help from the website

C. difference in languages and places

D. difference in cultures