问题 选择题

图中乙是甲的电解池进行电解时的某个量(纵坐标x)随时间变化的曲线(各电解池都用石墨作电极,不考虑电解过程中溶液浓度变化对电极反应的影响),则x表示(   )

A.各电解池析出气体体积总数的变化

B.各电解池阳极质量的增加

C.各电解池阴极质量的增加

D.各电极上放电的离子总数的变化

答案

答案:C

③随着电解的进行x值始终为0,可排除A项;三个电解池的阳极上都是阴离子放电,其中①②中析出的都是氧气,质量相同,故可排除B项。各电极上放电的离子总数①③是相同的,所以D项也不正确

多项选择题
阅读理解

第三部分:阅读理解(共20题;每小题1.5分,满分30分)

阅读下列短文,从每题所给的四个选项中,选出最佳选项。

From age eight to eleven, I attended a small school in Bath, England. It was a small school of four classes with about twenty-five children in each class according to age. For the most part, one teacher had to teach all subjects to the children in the class. However, sometimes the headmaster, Mr. Ronald Broaches, would come in and spend an hour or so, teaching some subjects in which he was especially interested. He was a large man with a very happy nature. He had a sense of humor and would delight in telling the children small stories that would make us laugh. He was a very fair man and had a great influence on many of the children. In my own case, I found that he took great interest in me and he quickly found that I enjoyed puzzles. He would often stop me as I was going to class and take a piece of paper out of his pocket, often with a puzzle already on it. The puzzles were usually mathematical or logical. As time went on, they slowly got more difficult, but I loved them. Not only that, they made me interested in math and problem solving that stays with me to this day. They also served to show me that intellectual activity was rewarding when the correct answers were found, but perhaps more importantly it was great fun. To this day, I can remember Mr. Broaches’ cheerful cry of “Well done!” whenever I got a problem right. The simple communication with a man whom I loved greatly has had a deep influence on my life. I shall forever be thankful that our paths crossed. Mr. Broaches died just two weeks after I had won the 1993 Nobel Prize in Physiology or Medicine. Unluckily, I had no chance to speak to him before he died. I learnt later that he had heard of my success and I will always hope that he knew the deep influence he had made on my life.

56. There were ________ children in each class when Richard was in     the school in Bath, England.

A. 4          B. 8        C. 11              D. 25

57. From the text, we can learn that ___________.

A. the puzzles made the students laugh

B. the students were afraid of the headmaster

C. the puzzles made Richard enjoy math

D. the headmaster never taught in the school

58. The writer felt sorry because __________.

A. Mr. Broaches had passed away before he won the Nobel Prize

B. he didn’t express his thanks before Mr. Broaches died

C. he couldn’t find Mr. Broaches after he grew up

D. Mr. Broaches didn’t know his success

59. What is the best title(标题)for the text ?

A. The Story of Mr. Broaches.

B. The Story of Richard J. Roberts.

C. My Early School Life.

D. An Important Teacher in My Life.