以下()不是udp协议的特性
A、提供可kao服务A
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JackisateacherofEnglish.Heisnotyoung,butheisnotold.Hehasaroundfaceandblackhair.Heistall.Therearefiftystudentsinhisclass.Theyalllikehim.Nowit'sintheafternoon.Look,somestudentsareworkingintheclassroom.Jackisthere,too.HeishelpingthemtostudyEnglish.Heisagoodteacher,andheisagoodfriendofthemall.
()1.WhatdoesJackdo?
A.Heisaworker.
B.Heisateacher.
C.Heisadoctor.
D.He'sanurse.
()2.Whatcolourishishair?
A.It'sblack.
B.Hisheiriswhite.
C.Itisbrown.
D.Hehasyellowhair.
()3.Howmanystudentsarethereinhisclass?
A.Therearefifteenstudentsinhisclass.
B.There'sfifty.
C.Hehasfifty.
D.There'refiftyinit.
()4.Jackisagoodteacher,isn'the?
A.Yes,heisn't.
B.No,heis.
C.Yes,he's.
D.Yes,heis.
()5.Whatarethestudentsdoingintheclassroom?
A.Theyarewalkingthere.
B.Theyaredoingtheirlessons.
C.Theyarehelpingtheirteacher.
2013年以来,深圳部分高校学子为实现人生价值,放弃了优越的工作环境,毅然选择到西部支教或就业。据统计,北京大学深圳研究生院汇丰商学院有约40名学生选择到西部就业;深圳大学共有5名志愿者前往西部支教。上述材料给我们的启示是
①要具有社会责任感,积极履行社会责任②只有在艰苦的环境中才能实现人生理想
③在人生发展的过程中,理想激励着我们不断超越自己④我们要有勇气作出自己的选择,并为此担负起责任
能同时被2、3、5整除的最小两位数是________,最大两位数是________.
图中有①________个三角形,②________个长方形,③________个梯形.
She_____(like)toplaytheflute.