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Mankind’scapacitytostorethelargeamountofinformationintheworldhasbeenmeasuredbyscientists.Thestudy,publishedinthejournalScience,calculatestheamountofdatastoredintheworldby2007was295exabytes.That’sequalto1.2billionaverageharddrives.“Ifweweretotakealltheinformationandstoreitinbooks,wecouldcovertheentireareaoftheUSorChinain3layersofbooks,”Dr.MartinHilbertoftheUniversityofSouthernCaliforniatoldBBC’sScienceinAction.By2007,94%ofstoredinformationwaskeptdigitally.ThesameinformationstoreddigitallyonCDswouldcreateastackofdiscsthatwouldreachbeyondthemoon,accordingtotheresearchers.Thefastestgrowingareaofinformationoperationhasbeencomputation.Duringthetwodecadesthesurveycovers,globalcomputingcapacityincreasedby58%peryear.Thesenumbersmaysoundlarge,buttheyarestilldwarfed(相形见绌)bytheinformationprocessingandstoragecapacityofahumanbeing.Thisstudylookedattheworldasawhole,butthescientistssaythatitdoesshowthatthe“digitaldivide”betweenrichandpoorcountriesisgrowing.Despitethespreadofcomputersandmobilephones,thecapacitytoprocessinformationisbecomingmoreunequal.In2002,peopleinthedevelopedworldcouldcommunicateeighttimesmoreinformationthanpeopleinthedevelopingworld.Justfiveyearslater,in2007,thatgaphadnearlydoubled,andpeopleinrichercountrieshad15timesmoreinformationcarryingcapacity.1.Before2007,moststoredinformationwaskeptintheformof.A.picturesB.wordsC.digitsD.sounds2.WhatcanwelearnfromParagraph3?A.Globalcomputingcapacitytostoreinformationismorepowerfulthanmankind’scapacity.B.Mankind’scapacitytostoreinformationismorepowerfulthanglobalcomputingcapacity.C.Globalcomputingcapacitytostoreinformationisincreasingslowly.D.Globalcomputingcapacityincreasedby58%peryearduringthelast30years.3.Whatdoweknowaboutthe“digitaldivide”?A.Digitsaredividedintoseveralparts.B.Differentcountrieshavedifferentformsofdigitalinformation.C.Thecapacitytoprocessinformationisequalamongcountries.D.Richcountriescancommunicatemoreinformationthanpoorcountries.4.Theword“gap”canbebestreplacedbytheword.A.blankB.differenceC.breakD.shape5.Whichofthestatementsiswrongaccordingtothetext?A．By2007,94%ofstoredinformationwaskeptdigitally.BThefastestgrowingareaofinformationoperationhasbeencomputation.C．Thestrdyshowsthatthe“digitaldivide”betweenrichandpoorcountriesisnotgrowing.D.Despitethespreadofcomputersandmobilephones,thecapacitytoprocessinformationisbecomingmoreunequal.

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Are you looking for a career change, but lack the necessaryeducation? Consider returning to school to receive career training. Ajob-specific career education program can greatly improve your employment opportunities.According to the US Census Bureau, people with a Bachelor’s degreeearned, on average, nearly $51,206 per year. Those with only a high school diploma earned just $27,915 per year. The right career educationaffords you greater opportunity and pay. It also provides greater job securityand satisfaction.Career Explorer is here to help you navigate (航行) through a wealth of information about your future career. Findthe information on the ten hottest careers. If you don’t know where you want to work, we would provide you with a widerange of career descriptions. Several of them are in the business field or ofmedical professions. We also have information about the truck driving industry.For on-the-job experience, check out our tips for finding the right job for you.If you are looking for career training, Career Explorer can assist you. We provide a list of degree programs and a list of online training programs. If you need assistance understanding financial aid, we have descriptions of FAFSA, scholarships, loans, and military aid. You can even take a free career talent test to determine your skills and interest.Career Explorer has you covered when you start looking for work.We can also give you ideas for building your résumé, writing better cover letters (求职信), and thank you letters. In addition, we offer salary information and a continuing education school search. We also have information on how tofile for unemployment and the benefits of the Work force Investment Act.Improve your chances of a better job with career-specific training. Career Explorer is your career training resource.1. Employment opportunities can be increased if you .A. change careers B.receive higher educationC. consider returning to school D. receive job-specific career training2. Which of the following statements is true according to the USCensus Bureau?A. People with a Bachelor’s degree earned twice as much as thosewith a high school diploma.B. People with a high school diploma earned twice as much as thosewith a Bachelor’s degree.C. On average, people with a Bachelor’s degree earned more thanthose with a high school diploma.D. People with a high school diploma earned more than those with aBachelor’s degree, on average.3. Career Explorer can offer assistance on .A. online career training programs B. career talent testC. a continuing education school search D. all of the above4. The purpose in writing the passage is to .A. advertise Career ExplorerB. improve the chances of getting a better jobC. draw people’s attention to educationD. offer career training5. When you are looking for a career change, but lack the necessary education, you should consider returning to to receive career training.A. homeB. schoolC. officeD. workplace

功率放大器与小信号电压放大器的共同点是（）。

A. 都使输出电压大于输入电压；
B. 都使输出电流大于输入电流；
C. 都使输出功率大于信号源提供的输入功率。

集成运放采用直接耦合方式主要是因为（）

A. 可获得较大的电压增益；
B. 可使“零漂”减小；
C. 提高输入电阻。

集成运放的输入级之所以采用差动放大电路，主要是可以（）。

A. 提高输入电阻；
B. 增大电压增益；
C. 抑制“零漂”