题目内容
（请给出正确答案）
A.LOOK算法总比SCAN算法优
B.SCAN算法中磁头从磁盘一端向另一段移动，沿途响应服务请求。当到达另一端时，磁头改变移动方向，继续处理沿途请求
C.C-SCAN和SCAN不同之处在于C-SCAN是单向处理请求
D.和LOOK算法相比，SCAN算法则磁头只移动到一个方向上最远请求为止，而不是继续到磁盘尽头
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更多“以下有关SCAN和LOOK算法的叙述正确的是（)。”相关的问题
B、使用历史广告的转化人群作为种子人群，新积累的转化人群会自动更新到种子人群里进行扩展
C、种子人群的数量越大越好
D、选择扩展量级时，先根据种子包量级扩一个较小的倍数，效果好后逐渐放大量级
Thefollowingtipscanhelpifyouhavesomeoftheseworries.
★Startoutslowly,don’taddtoomuchpressure.Evenafewhoursamonthcanmakeabigdifferenceinsomeone’slife.
★Chooseanorganizationwiththesameinterestsandcommonvalues.
★Takepartinatrainingmeetingfornewvolunteers,evenifitisnotasked.
★Workwithaveteranvolunteer.Hevolunteeredalot,hecanhelpyouincreasetheconfidenceandcompletelyunderstandtheorganization’sexpectations.
★Inviteafriendorfamilymembertoserve.Itisagoodexperiencetovolunteerwiththem.
★Finally,itismostimportanttoenjoythevolunteerexperienceandtorememberthatnotallvolunteerexperiencesareperfect.Ifoneexperiencedoesn’twork,don’tgiveupandyou’llsurelyfindtherightopportunity.
Spendsometimeonvolunteerworkandyouwillseegreatchangesinpeople’slives.AsMasondiscoveredduringhisvolunteerexperience,“…littlethingscanchangeaperson’slife.”
1.Volunteeringcanhelp_________.()
A.makeadecision
B.seetheworldclearly
C.thankotherpeople
D.makeperson’slifebetter
2.Whatcouldbethereasontostoppeopletakingthefirststep?()
A.Theydon’thaveenoughtime.
B.Theyarepreventedbytheirfamilies.
C.Theyfearthattheirabilitiesareshared.
D.Theydon’texpecttobecomevolunteers.
3.Whichofthefollowingcanhelppeopletakethefirststep?()
A.Startoutquickly.
B.Organizeatrainingmeeting.
C.Inviteafriendtobewiththem.
D.Joininagroupwithdifferentvalues.
4.Theunderlinedword“veteran”inthepassagemeans“_______”.()
A.polite
B.humorous
C.young
D.experienced
5.Whatisthemainideaofthepassage?()
A.Totellpeopletomakechangesintheirlives.
B.Toencouragepeopletostarttheirvolunteering.
C.Howtomakegreatachievementsinvolunteering.
D.Howtokeeponvolunteeringwhateverhappened.
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