搜题请搜索小程序“爱下问搜题”
问题 选择题

李先生忘记了自己电脑的开机密码，但记得密码是由两个3，一个6，一个9组成的四位数，于是，他用

这四个数字随意排成一个四位数输入电脑尝试、那么他打开电脑最多尝试的次数为（　　）

A．64

B．18

C．12

D．6

答案

∵密码是由两个3，一个6，一个9组成的四位数，

∴所有的排列共有A44=24种结果，

在这些结果中，因有两个3而出现A22=2种重复排列，

∴打开电脑最多尝试的次数是

24
2
=12

故选C．

阅读理解

          Inventor
Can you patent and profit from your idea?
We have been assisting inventors since 1975. Full range of patenting and marketing services.
Confidentiality guaranteed.
American Inventors Corp.
Call for free information:
1-800-338-5656
or visit www.aic.com
            Parents
Can you afford to raise your hearing impaired child without the insights this highly valued book has to offer? Make life easier for you and your child!
Bradford Publications
For information:
1-800-354-2760
or visit www.bpublications.com
         ____________
Earn up to $25,000 a year as a Medical Transcriptionist!
No experience is needed. Work the hours you choose. Train at home in your spare time. The medical profession needs skilled transcriptionists. So if you can type, or are willing to learn, we can train you to work at home doing medical transcriptions from tapes dictated by doctors. Get free information!
At-Home Profession Corp.
Call Toll Free 1-800-475-0100
or visit www.athome.com
     Globe Insurance Company
Since 1951, Globe has grown in financial strength and reputation. With over 2.8 million policies in force, Globe is committed to providing affordable life, health and accident insurance for the entire family. It only costs $1 to start your Longlife coverage.
Globe Insurance Company
Call Toll Free, Seven Days A Week, 24 hours A Day.
1-800-358-1945
or visit www.globeic.com
小题1:.  The best title of the 3rd advertisement would be _______________.
A．Training at HomeB．Learning at Home
C．Recording WorkD．Working at Home
小题2:.  ．According to the information above, if your child has hearing problems, you can turn to _______________.
A．At-Home Profession CorpB．Globe Insurance Company
C．Bradford PublicationsD．American Inventors Corp
小题3:.  From the advertisements above, we can learn that ____________.
A．Globe Insurance Company has a history of 51 years..
B．as a medical transcriptionist, you may earn $25,000 a month
C．Bradford Publications offers a treatment to hearing impaired parents
D．you can visit www.aic.com when you invent a new model of hearing aid.
查看答案
单项选择题

在购房者越来越年轻的情况下，( )成为房地产经纪公司搜集和发布房源信息的重要途径。

A．报纸广告
B．路牌广告
C．派发DM宣传单
D．互联网
查看答案