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ThenumberofspeakersofEnglishinShakespeare’stimeisestimated(估计)tohavebeenaboutfivemillion.Todayitisestimatedthatsome260millionpeoplespeakitasanativelanguage,mainlyintheUnitedStates,Canada,GreatBritain,Ireland,SouthAfrica,AustraliaandNewZealand.InadditiontothestandardvarietiesofEnglishfoundintheseareas,thereareagreatmanyregionalandsocialvarietiesofthelanguageaswellasvariouslevelsofusagethatareemployedbothinitsspokenandwrittenforms.Infact,itisimpossibletoestimatethenumberofpeopleintheworldwhohaveacquiredanadequate(足够的)workingknowledgeofEnglishinadditiontotheirownlanguages.ThepurposeforEnglishlearningandthesituationsinwhichsuchlearningtakesplacearesovariedthatitisdifficulttoexplainandstillmoredifficulttojudgewhatformsanadequateworkingknowledgeforeachsituation.ThemainreasonforthewidespreaddemandforEnglishisitspresent-dayimportanceasaworldlanguage.Besidesservingtheindefiniteneedsofitsnativespeakers,Englishisalanguageinwhichsomeofimportantworksinscience,technology,andotherfieldsarebeingproduced,andnotalwaysbynativespeakers.Itiswidelyusedforsuchpurposesasmeteorologicalandairportcommunications,internationalconferences,andthespreadofinformationovertheradioandtelevisionnetworksofmanynations.Itisalanguageofwidercommunicationforanumberofdevelopingcountries,especiallyformerBritishcolonies.Manyofthesecountrieshavemultilingualpopulationsandneedalanguageforinternalcommunicationinsuchmattersasgovernment,commerce,industry,lawandeducationaswellasforinternationalcommunicationandforentrancetothescientificandtechnologicaldevelopmentsintheWest.WhattypeofdevelopingcountrieswouldbemostlikelytouseEnglish
如果在文本框中键入字符时，只显示某个字符，如星号（*），应设置文本框的（）属性。
下列属于冠心病一级预防内容的是（）
You are creating an assembly named Assembly1.Assembly1 contains a public method. The global cache contains a second assembly named Assembly2.You must ensure that the public method is only called from Assembly2.Which permission class should you use？（）
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