问题
单项选择题
E-MAIL软件应用中验证数位签名可以（）。
A、帮助检查垃圾邮件（spam）
B、实现保密性
C、加重闸道服务器的负载
D、严重降低可用的网络带宽
答案
参考答案：A
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E-MAIL软件应用中验证数位签名可以（）。
A、帮助检查垃圾邮件（spam）
B、实现保密性
C、加重闸道服务器的负载
D、严重降低可用的网络带宽
参考答案：A
| 完形填空。 | |||
| For many people today,reading is no longer relaxation.To keep up their work they must read letters,reports,trade publications,interoffice communications,not to mention newspapers and magazines;a never-ending flood of words.In 1 a job or advancing in one,the ability to read and comprehend 2 can mean the difference between success and failure.Yet the unfortunate fact is that most of us are 3 readers.Most of us develop poor reading 4 at an early age,and never get over them.The main deficiency(缺陷)5 in the actual stuff of language itself-words.Taken individually,words have 6 meaning until they are strung together into phrases,sentences and paragraphs.7 however,the untrained reader does not read groups of words.He laboriously reads one word at a time,often regressing to 8 words or passages.Regression,the tendency to look back over 9 you have just read,is a common bad habit in reading.Another habit which 10 down the speed of reading is vocalization-sounding each word either orally or mentally as 11 reads. To overcome these bad habits,some reading clinics use a device called an 12,which moves a bar(or curtain)down the page at a predetermined speed.The bar is set at a slightly faster rate 13 the reader finds comfortable,in order to "stretch" him.The accelerator forces the reader to read fast,14 word-by-word reading,regression and subvocalization,practically impossible.At first 15 is sacrificed for speed.But when you learn to read ideas and concepts you will not only read faster,16 your comprehension will improve.Many people have found 17 reading skill greatly improved after some training.18 Chalice Au,a business manager,for instance,his reading rate was a reasonably good 172 words a minute 19 the training,now it is an excellent 1378 words a minute.He is delighted that how he can 20 a lot more reading materials in a short period of time. | |||
| ( )1.A.applying ( )2.A.quickly ( )3.A.good ( )4.A.training ( )5.A.lies ( )6.A.some ( )7.A.Fortunately ( )8.A.reuse ( )9.A.what ( )10.A.scales ( )11.A.some one ( )12.A.accelerator ( )13.A.then ( )14.A.enabling ( )15.A.meaning ( )16.A.but ( )17.A.our ( )18.A.Look at ( )19.A.for ( )20.A.master | B.doing B.easily B.eager B.habits B.combines B.a lot B.In fact B.reread B.which B.cuts B.one B.actor B.as B.leading B.comprehension B.nor B.your B.Take B.in B.go over | C.offering C.roughly C.poor C.situations C.touches C.little C.Logically C.rewrite C.that C.slows C.he C.applicator C.beyond C.making C.content C.or C.their C.Make C.after C.present | D.getting D.decidedly D.urgent D.custom D.involves D.dull D.Unfortunately D.recite D.if D.measures D.reader D.observer D.than D.indicating D.regression D.for D.such a D.Consider D.before D.get through |