问题 选择题

用惰性电极分别电解下列各物质水溶液一段时间后,向剩余电解质溶液中加入适量水,能使溶液恢复到电解前浓度的是

A.AgNO3

B.Na2SO4

C.CuCl2

D.H2SO4

答案

BD

考查电解产物的判断。向剩余电解质溶液中加入适量水,能使溶液恢复到电解前浓度。说明电解的物质是水,因此选项BD正确。A中硝酸银也被电解,有关加入氧化银;C中氯化铜全部被电解,有关加入氯化铜,答案选BD。

阅读理解

This is a story  that happened 15 years ago but it has always stayed with me since then.On the way back from work every evening,more often than not there would be a homeless man standing at the exit of the freeway.He always waved at every car,he was always happy and smiling and sometimes almost dancing.Every day after work when I got there,I would quickly roll down my window and give him the coins.Occasionally the red light would be on for a minute and we would ask each other about our day.His answer would always be the same,“I’m blessed!”.

It amazed me that even in his situation of being homeless he was so positive,and his answer would remind me of how blessed I was.A single mother of four amazing kids,with a place to call home and with a job to provide for my kids.Then one day I was called into my boss’s office and was told that I was being laid off due to the economy.Needless to say that on my was home that day I was very sad and upset.I didn’t remember to look for my spare change and keep it ready like I usually did.I wasn’t feeling the joy as I got off the ramp where the homeless man would be.Yet there he was as alway,as l turned the ramp.He set his eyes on me,while still smiling and waving at others.

While I was waiting for the red light to turn,he strolled over to my car.He had a big smile he looked me straight in the eyes and said “today I will give you a dollar”.He then reached into his pocket and pulled out a dollar bill.I was blown away.I burst into tears.I wanted to jump out of my car and hug him!

You see that day he gave me more than a dollar bill,he taught me a valuable lesson.No matter  what material things are taken  from you,no one can take away your choice to be joyful.

小题1:What is the passage mainly concerned?

A.A dollar bill from a homeless person.

B.A blessing coming from a homeless person.

C.A woman who lost her job due to the economy.

D.A homeless man standing at the exit of the freeway.小题2:From the lst paragraph,we know the homeless man is         .

A.optimistic

B.brave

C.Iazy

D.kind-hearted小题3:After leaving the boss’s office,the author         .

A.felt relaxed to get rid of the tiring job

B.still felt joyful when coming off the ramp

C.took it for granted that she was fit for her job

D.didn’t put some change aside to give to the man小题4:The underlined phrase“blown away”in the 3rd paragraph most probably  means

       .

A.completely defeated

B.wholly blown down

C.really amazed

D.murdered by gunfire小题5:It can be inferred from the passage that         .

A.material things are the most important in life

B.people should be encouraged to beg by smiling

C.the author’s ride home that dog was smooth sailing

D.we should wait others’help when faced with challenges

单项选择题