问题 选择题

有3份等质量的小苏打,第1份直接与盐酸恰好完全反应;第2份首先加热,使其部分分解后,再与盐酸恰好完全反应;第3份首先加热,使其完全分解后,再与盐酸恰好完全反应。假若盐酸的物质的量浓度相同,消耗盐酸的体积分别为V1、V2和V3,则V1、V2和V3的大小关系正确的是(  )。

A.V1>V2>V3

B.V1>V3>V2

C.V2>V3>V1

D.V1=V2=V3

答案

答案:D

3份小苏打质量相等,无论是直接与盐酸反应,还是部分分解或完全分解后与盐酸反应,最终得到的都是NaCl溶液,其中Cl来自于盐酸,Na来自于NaHCO3,3份消耗盐酸的体积相同。

单项选择题
阅读理解

阅读理解。

     "Everything happens for the best," my mother said whenever I faced disappointment. "If you carry on,

one day something good will happen. And you'll realize that it wouldn't have happened if not for that

previous disappointment."

      Mother was right, as I discovered after graduating from college in 1932, I had decided to try for a job in radio, then work my way up to a sports announcer. I hitchhiked to Chicago and knocked on the door of every station-and got turned down every time. In one studio, a kind lady told me that big stations couldn't risk hiring an inexperienced person. "Go out in the sticks and find a small station that'll give you a chance," she said. I thumbed home to Dixon, Illinois.

     While there were no radio-announcing jobs in Dixon, my father said Montgomery Ward had opened a store and wanted a local athlete to manage its sports department. Since Dixon was where I had played high school football, I applied. The job sounded just right for me. But I wasn't hired. My disappointment must have shown. "Everything happens for the best." Mom reminded me. Dad offered me the car to hunt a job. I tried WOC Radio in Davenport, Iowa. The program director, a wonderful Scotsman named Peter MacArthur told me they had already hired an announcer.

      As I left his office, my frustration (挫折) boiled over. I asked aloud, "How can a fellow get to be a sports announcer if he can't get a job in a radio station?" I was waiting for the elevator when I heard MacArthur calling, "What was you said about sports? Do you know anything about football?" Then he stood me before a microphone and asked me to broadcast an imaginary game. The preceding (在前的) autumn, my team had won a game in the last 20 seconds with a 65-yard run. I did a 15-minute build-up to that play, and Peter told me I would be broadcasting Saturday's game! On my way home, as I have many times since, I thought of my mother's words: "If you carry on, one day something good will happen. Something wouldn't have happened if not for that previous disappointment."

      I often wonder what direction my life might have taken if I'd gotten the job at Montgomery Ward.

1. The writer shows his _____ by saying ""… if I'd not gotten the job at Montgomery Ward".

A. regret    

B. happiness    

C. gratefulness    

D. disappointment  

2. The underlined phrase "out in the sticks" probably means _____?    

A. in radio stations     

B. in the country     

C. in big cities         

D. in Dixon, Illinois 

3. Why did the writer mention his mother's words over and again? Because _____.     

A. it was his mother's words that encouraged him     

B. his mother was a person who talked a lot    

C. nothing good has happened to him up to now     

D. he got turned down every time he tried

4. Which of the following statements is true according to the passage?    

A. There was a small radio station in Dixon, Illinois.     

B. Peter MacArthur was a program director in Scotland.    

C. WOC Radio in Davenport broadcast imaginary games.     

D. Montgomery Ward had a store with a sports department.

5. When did the writer decide to take a radio-announcing job?     

A. When he hitchhiked to Chicago.    

B. After he graduated from college.     

C. Before he graduated from college. 

D. As soon as he was turned down.