首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
To fight against computer crimes, a computer system needs a sure way of identifying its right users and rejecting those who are
To fight against computer crimes, a computer system needs a sure way of identifying its right users and rejecting those who are
admin
2010-05-09
41
问题
To fight against computer crimes, a computer system needs a sure way of identifying its right users and rejecting those who are not entitled to use it. The identification system should be quick, simple, and convenient.
At present, signatures are widely used to identify credit card holders, but it takes an expert to detect a good forgery. Sometimes even a human expert is fooled, and there is no reason to believe that a computer could do any better.
Photographs are also sometimes used for identification. But, people find it inconvenient to stop by a credit-card company and to be photographed. Companies might lose business if they made the pictures under absolute requirement. Also, photographs are less useful these days, when people frequently change their appearance by changing the way they wear their hair. Finally, computer programs for analyzing photographs are still highly experimental.
Cash-drawing systems often use two identification numbers: One is recorded on a magnetic stripe on the identification cards, and the other is given to the CRS holder. When the user inserts his card into the cash-drawing terminal, he keys in the identification number he has been given. The computer checks to see that the number recorded on the card and the other keyed in by the user refer to the same person.
For a long time, fingerprints have provided a method of positive identification. But they suffer from two problems. One is that there is no simple system for comparing fingerprints electronically, the other is that because most people associate being fingerprinted with being arrested; they almost surely would resist being fingerprinted for routine identification.
Voiceprints have been suggested. With these, the user has only to speak a few words for the computer to analyze his voice. There are no psychological problems here. And technically it’s easier to take and analyze voiceprints than fingerprints. However, it has yet to be proved that the computer cannot be fooled by imitation. Also, the voice is subjected to the noise and distortion of a telephone line.
Even lipprints have been suggested. But it’s doubtful that kissing computers will ever catch on.
The passage is organized by _______.
选项
A、a simple listing of facts
B、presenting a solution and discussing its advantages or disavantages
C、cause and effect
D、comparison and contrast
答案
B
解析
主旨题 文章首先就提出计算机识别系统的基本原则,然后逐一例举可采用的方法及其利与弊,可知B项符合文章的谋篇模式。
转载请注明原文地址:https://kaotiyun.com/show/YSOK777K
0
大学英语六级
相关试题推荐
Howwouldyoudesignanaircraftifyourmainaimweretokeepitsroarfromwakinguptheentireneighborhoodduringtakeoffs
A、Moreandmorestudentslikefoodavailableoncampus.B、Ritzerthinksthatfastfoodisgood.C、Fastfoodmakespeople’slife
Expertswondered__________________(生活在这里的各族人的祖先是从哪里迁来的).
Publicopinionpollsareregularlyconductedandpublishedinmanycountries.They(36)______notonlysupportforpoliticalpar
A、ThatDavidisnotaseriousstudent.B、ThatDaviddoesn’tneedtoworrybecausehehasascholarship.C、ThatDavidwon’tspeak
A、Trainers.B、Clowns.C、Acrobats.D、Magicians.AWhichofthcfollowingperformerscannotbefoundinCirqueduSoleil?信息明示题。女士说
A、Matterhasdifferentlaws.B、Matterhasonecommonlaw.C、Mattersharesthesamelaws.D、Mattersharesnocommonlaw.CWhatdo
Thebacteriathatcauseacommonfood-borneillnessshowlowdrugresistanceinAustralia,unlikesimilarstrainsfromtheUnite
Spendingtimeinabookshop______.Accordingtotheauthor,filebestwaytoescapetherealitiesofeverydaylifeis______.
A、Rememberingasmanywordsaspossible.B、Learningonlyusefulwords.C、Rememberingalotofwordsaday.D、Learningtouseaf
随机试题
关于书刊版面字数,说法正确的有()。
下列哪一项不属于逆转录酶的功能:()
胸外伤后,胸壁软化(浮动胸)最主要的原因是
引起特发性血小板减少性紫癜发病的相关因素中不包括
下列调肝和胃药中,何药兼活血散瘀
植被样方调查中,表示植被中的重要值为()。
20×7年6月3日,甲企业购买了乙企业20×7年6月1日发行的、账面价值为2000万元的公司债券,购买价格为1970万元。债券票面年利率为5%,于次年6月15日支付上年度利息,到期归还本金。甲企业将该笔交易划分为交易性金融资产,购买时支付交易费用10万元,
下列各项中,属于投资性房地产的有()。
きょうは花火大会があるから()食事をして出かけましょう。
A)Toawriter,self-publishingisanincrediblypowerfulandalluringconcept.Onthesimplestlevel,it’sanintriguingsoluti
最新回复
(
0
)