首页
登录
职称英语
[originaltext] It’s always fun to write about research that you can actually
[originaltext] It’s always fun to write about research that you can actually
游客
2023-08-09
26
管理
问题
It’s always fun to write about research that you can actually try out for yourself. Try this: Take a photo and upload it to Facebook, then after a day or so, know what the URL link to the picture is and then delete it. Come back a month later and see if the link works. Chances are, it will. Facebook isn’t alone here. Researchers at Cambridge University have found that nearly half of the social networking sites don’t immediately delete pictures when a user request they be removed. In general, photo-centric websites like Phlica were found to be better at quickly removing deleted photos upon request. Why do deleted photos stick around so long? The problem relates to the way data is stored on large websites. While your personal computer only keeps one copy of a file, large-scale services, like Facebook, rely on what are called Content Delivery Networks to manage data and distribution. It’s a complex system wherein data is copied to multiple intermediate devices, usually to speed up access to files when millions of people are trying to access the service at the same time. But because changes aren’t reflected across the Content Delivery Networks immediately, ghost copies of files tend to linger for days or weeks. In the case of Facebook, the company says data may hang around until the URL link in question is reused, which is usually after a short period of time, though obviously that time can vary considerably.
Questions 13 to 15 are based on the passage you have just heard.
13. What does the speaker ask us to try out?
14. What accounts for the failure of some websites to remove photos immediately?
15. When will the unwanted data eventually disappear from Facebook according to the company?
选项
A、The number of visits they receive.
B、The way they store data.
C、The files they have collected.
D、The means they use to get information.
答案
B
解析
听力篇章中间提及不能马上清除照片的原因:这和大型网站上存储信息的方式有关。由此判断B)为正确选项。
转载请注明原文地址:https://tihaiku.com/zcyy/2910101.html
相关试题推荐
[originaltext]M:Ireallydon’tknowwhattodothissummer.[5]Ican’tafford
[originaltext]M:Ireallydon’tknowwhattodothissummer.[5]Ican’tafford
[originaltext]W:ThisisLisaMeyerintheWBZnewsroom,talkingwithMikeBass
[originaltext]W:ThisisLisaMeyerintheWBZnewsroom,talkingwithMikeBass
[originaltext]W:ThisisLisaMeyerintheWBZnewsroom,talkingwithMikeBass
[originaltext]Theaveragepersonlearnsmostofthe30,000-40,000wordswhosem
[originaltext]Theaveragepersonlearnsmostofthe30,000-40,000wordswhosem
[originaltext]AmericanvisitorstoEastAsiaareoftensurprisedandpuzzledby
[originaltext][16]Theprivatemotorvehiclehasgivenusafreedomourancesto
[originaltext][16]Theprivatemotorvehiclehasgivenusafreedomourancesto
随机试题
Teamworkplaysanimportantpartinourdailylifeandwork,butsometimesp
[originaltext]Life-styleisthewayapersonlives;itincludeswork,leisu
有关蛋白质三级结构描述,错误的是()。A.具有三级结构的多肽链都有生物学活性
从所给四个选项中,选择最合适的一个填入问号处,使之符合已呈现的规律: A.
男性,26岁。突然出现抽搐,从一侧手指开始,向腕部、臂、肩部及半身扩展。诊断最大
A.椭球面B.旋转双曲面C.旋转抛物面D.圆柱面
阅读《雨巷》教学反思的片段,按要求答题。 “知人论世,体物会意”是读诗的重
基差为正且数值越来越大,或者基差从负值变为正值,或者基差为负值且绝对数值越来越小
A.血钙正常,血磷下降,碱性磷酸酶增高,25(OH)D正常 B.血钙下降,血磷
女,65岁。因大量蛋白尿入院,肾活检示膜性肾病,予泼尼松60mg/日治疗3周,突
最新回复
(
0
)