洁净厂房与交通干道之间的距离,正确的是()。
A、宜大于50mA
暂无解析
若5条鱼的平均质量为0.8kg,其中3条的质量分别为0.75kg,0.83kg和0.78kg,则其余2条的平均质量为_____kg.
属于知识密集型的高科技产业是()
you,me,please,could,help
______________________________________
隋朝时开通的大运河,其最南端在今天的()
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.