问题 选择题

把a、b、c、d四块金属片浸在稀硫酸中,用导线两两连接可以组成原电池,若a、b相连时a为负极;a、c相连时c极上产生大量气泡;b、d相连时b为正极;c、d相连时,电流由d到c.则这四种金属的活动性顺序由大到小为(  )

A.a>c>d>b

B.a>b>c>d

C.c>a>b>d

D.b>d>c>a

答案

由a、b相连时a为负极得,a的活泼性大于b;

由a、c相连时c极上产生大量气泡得,a的活泼性大于c; 

由b、d相连时b为正极得,d的活泼性大于b;

由c、d相连时,电流由d到c得,c的活泼性大于d.

所以金属的活动性顺序由大到小为a>c>d>b

故选A.

完形填空
Mrs. Ball had a son. His name was Mick. She  26 him very much and as(因为)he was not a  27 child, she was always afraid that he might  28 ill.  29 she usually took him to see the best  30  in the town four times a year and asked the doctor to look  31 the son.
   During one of these  32 , the doctor gave Mick all kinds of tests(检查) and then said to him, “Do you have any trouble with your nose or ears ?” Mick  33 for a second and then answered, “Yes, I  34 _.”
  Mrs. Ball was very  35 . “But I’m sure you have  36 told me that, Mick!” she said worriedly. “Oh, really?” said the doctor  37 . “And what trouble do you have  38 your nose and ears, my boy?” “Well,” answered Mick. “I always have trouble with them when I’m  39 my sweater off,  40  the collar (领子) is very tight (紧的).”
小题1:
A.lovedB.hatedC.missedD.cared
小题2:
A.rich  B.cleverC.strongD.happy
小题3:
A.is  B.areC.beD.were
小题4:
A.WhichB.OfC.ButD.So
小题5:
A.playerB.teacherC.doctorD.1awyer
小题6:
A.after  B.over  C.for  D.at
小题7:
A.talkersB.timesC.visitorsD.stays
小题8:
A.waited B.thoughtC.stoodD.looked
小题9:
A.did  B.do  C.doesD.doing
小题10:
A.excited B.interestedC.pleasedD.surprised
小题11:
A.alreadyB.just  C.neverD.always
小题12:
A.angrilyB.seriouslyC.happilyD.hardly
小题13:
A.for  B.at  C.of  D.with
小题14:
A.turningB.takingC.keepingD.putting
小题15:
A.because B.butC.althoughD.till
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