下列物质能导电且为电解质的是( ) A.酒精 B.Na2S04晶体 C.熔化的K

题型:选择题

问题:

下列物质能导电且为电解质的是(  )

A.酒精

B.Na2S04晶体

C.熔化的KCl

D.Cu

考点:电解质、非电解质导电性(单质、溶液、熔融状态导电)
题型:选择题

4x2=25。

题型:选择题

Mrs. Ball has a son. His name is Mick. She __1__ him very much and as he is not a __2 __ child, she is always __3__ that he may be ill, __4__ she takes him to see the best __5__ in the town four times a year and the doctor always looks him over__6__.
During one of these __7__, the doctor gives Mick all kinds of tests and then says to him, “Do you have any __8__ with your nose or ears these days?” Mick __9__ for a second and then answers, “Yes, I __10__.”
Mrs. Ball is very __11__. “But I’m sure you don’t tell me about__12__, Mick!” She says worriedly. “Oh, really?” Says the doctor seriously(严肃地). “And what trouble do you have __13__ your nose and ears, my boy?”“Well,” answers Mick, “I always have trouble with them when I’m _14_ my sweater off, because the _15_ is very tight(紧).”
小题1:
A.loves B.hates C.missesD.cares
小题2:
A.richB.cleverC.strongD.happy
小题3:
A.afraidB.surprisedC.gladD.sure
小题4:
A.whichB.forC.butD.so
小题5:
A.playerB.teacherC.doctorD.lawyer(律师)
小题6:
A.carefulB.carefullyC.happyD.sadly
小题7:
A.talkB.yearsC.visitD.stays
小题8:
A.answerB.thingC.wordD.trouble
小题9:
A.waitsB.thinks C.standsD.looks
小题10:
A.didB.willC.haveD.do
小题11:
A.excitedB.interested C.pleasedD.surprised(惊讶的)
小题12:
A.oneB.justC.thatD.always
小题13:
A.onB.withC.toD.for
小题14:
A.turningB.taking C.keepingD.putting
小题15:
A.collar(衣领)B.noseC.mouthD.ear
题型:选择题

下列省市中与北京接攘的是①河北省②辽宁省③天津市④山东省⑤山西省⑥河南省[ ]

A.①③

B.③③

C.③③

D.③③

题型:选择题

只存在于动物体内,植物体内不含有的维生素是()

A.维生素A

B.维生素B2

C.维生素C

D.维生素B1

题型:选择题

需要的产生是有机体内部生理上或心理上的某种()或()状态。

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