Americaisamobilesociety.FriendshipsbetweenAmericanscanbecloseandreal,yetdisappearsoonifsituationschange.Neithersidefeelshurtbythis.BothmayexchangeChristmasgreetingsforayearortwo,perhapsafewlettersforawhile—thennomore.Ifthesametwopeoplemeetagainbychance,evenyearslater,theypickupthefriendship.ThiscanbequitedifficultforusChinesetounderstand,becausefriendshipsbetweenusflowermoreslowlybutthenmaybecomelifelongfeelings,extending(延伸)sometimesdeeplyintobothfamilies.Americansarereadytoreceiveusforeignersattheirhomes,sharetheirholidays,andtheirhomelife.Theywillenjoywelcomingusandbepleasedifweaccepttheirhospitality(好客)easily.AnotherdifficultpointforusChinesetounderstandAmericansisthatalthoughtheyincludeuswarmlyintheirpersonaleverydaylives,theydon’tshowtheirpolitenesstousifitrequiresagreatdealoftime.Thisisusuallytheoppositeofthepracticeinourcountrywherewemaybegenerouswithourtime.Sometimes,we,ashosts,willappearatairportseveninthemiddleofthenighttomeetafriend.Wemaytakedaysofftoactasguidestoourforeignfriends.TheAmericans,however,expresstheirwelcomeusuallyathomes,buttrulycannotmanagethetimetodoagreatdealwithavisitoroutsidetheirdailyroutine.Theywillprobablyexpectustogetourselvesfromtheairporttoourownhotelbybus.Andtheyexpectthatwewillphonethemfromthere.Oncewearriveattheirhomes,thewelcomewillbefull,warmandreal.Wewillfindourselvestreatedhospitably.FortheAmericans,itisoftenconsideredmorefriendlytoinviteafriendtotheirhomesthantogotorestaurants,exceptforpurelybusinessmatters.Soaccepttheirhospitalityathome!1.Thewriterofthispassagemustbe______.A.anAmericanB.aChineseC.aprofessorD.astudent2.WhichofthefollowingstatementsisTRUEaccordingtothepassage?A.FriendshipsbetweenAmericansusuallyextenddeeplyintotheirfamilies.B.FriendshipsbetweenAmericansusuallylastforalltheirlives.C.Americansalwaysshowtheirwarmtheveniftheyareverybusy.D.Americanswillcontinuetheirfriendshipsagainevenafteralongbreak.3.FromthelasttwoparagraphswecanlearnthatwhenwearriveinAmericatovisitanAmericanfriend,wewillprobablybe______.A.warmlywelcomedattheairportB.offeredaridetohishomeC

设矩阵[img=172x51]17de8d6dc46b5ce.png[/img]，则 A: a=3，b=-1,c=1,d=3 B: a=-1，b=3,c=1,d=3 C: a=3，b=-1,c=0,d=3 D: a=-1，b=3,c=0,d=3

VBA表达式3*3\3/3的输出结果是( )。 A: A) 0 B: B) l C: C) 3 D: D) 9

VBA表达式3*3\3/3的输出结果是( )。 A: A) 0 B: B) 1 C: C) 3 D: D) 9

数学表达式如图对应的VB不正确的表达式是(). A: a*b/(3*c*d) B: a/3*b/c/d C: a*b/3/c/d D: a*b/3*c*d

若变量已正确定义,有以下程序段int a=3,b=5,c=7; if(a>b)a=b; c=a; if(c!=a)c=b; printf("%d,%d,%d\n",a,b,c);其输出结果是: ( ) A: 3, 5, 4 B: 3, 5, 3 C: 4, 5, 3 D: 3, 4, 3

QT600－3中，3表示（）。 A: Z≤3% B: A≥3% C: Rm≥3% D: ReL≤3%

－1/3的相反数是（） A: -3 B: 1/3 C: －1/3 D: 3

以下程序运行后，c和d的值分别是() int a = 3, b = 3, c, d; c = a = 3; d = b == 3;

与集合{x||x|=3}相等的集合为 A: {3} B: {-3) C: 3,-3 D: {3,-3}