问题 选择题

选用一种试剂就可以一次把物质的量浓度相同的Na2SO4、Na2SO3、Na2CO3、Na2S、BaCl2五种无色溶液加以区别,这种试剂是

A.CaCl2

B.Ba(OH)2

C.H2SO4

D.HCI

答案

答案:C

填空题
完形填空
Three  21  ago, my family got our first computer.  22  the beginning of this summer, I found it was too old and I wanted to get a  23  one. After my father. and I talked for a long time, he  24 . We went to many shops and read many ads.   25  we bought an HP computer.
During the first week, I noticed  26  our computer had some problems. I spent many hours   27  to fix it, but it   28  work. So I   29  to phone the HP compa­ny and ask them   30  to work out my problem. They told me to wait until the next morning because all their workers were 31 that day.
The next morning two workers came. It took them many hours to mend it, but the computer    32 did not work. My dad had no other way but to return the whole thing.
A few days later, we decided that I should go on the Internet and order some parts to build a new computer by  33 .
It was not an easy job for me to build a new computer. I tried many times, and in the end I was successful. From these setbacks(挫折), I have learned a lot. Now I be­lieve that if the HP computer hadn't had any problems,   34  I would not have learned how to build the new one. Even though I spent lots of time on it, I know it wasn't    35   .
小题1:
A. daysB. weeksC. monthsD. years
小题2:
A. AtB.OnC.ToD.For
小题3:
A. bigB.newC.cheapD.small
小题4:
A. wonB. paidC. agreedD. received
小题5:
A. At firstB.At lastC.At onceD. At times
小题6:
A. ifB. thatC.whatD. how
小题7:
A. tryB.triedC. to tryD.trying
小题8:
A. doB. didC. don'tD. didn't
小题9:
A. hopedB. haveC.hadD.liked
小题10:
A. howB. whatC. whyD. where
小题11:
A.freeB.sadC. busyD.exciting
小题12:
A.alreadyB.alwaysC. stillD. usually
小题13:
A.themselvesB. himselfC. itselfD. myself
小题14:
A. orB. thenC. soD.and
小题15:
A.a waste of timeB.a successful jobC. a good computerD. a bad company