摘要：32．
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33、在“探究通过导体的电流与电压、电阻的关系”的实验中，小明同学设计了如图所示电路图，小丽同学认为要“探究通过导体的电流与电压的关系”，电路图不够完善，应该增加一个滑动变阻器．
（1）小丽同学为什么要增加一个滑动变阻器？
如果不增加滑动变阻器，你还有其它方法吗？
（2）实验中，小明在闭合开关S后，发现两电表的指针正常偏转，但总是在晃动，无法准确读数，造成此现象的原因可能是
（3）经重新调整后，利用电压表和电流表测得的实验数据如下表所示，请分析表中实验数据，你认为错误的实验数据是
（4）排除错误数据后，根据表中数据和U-I关系图象，你归纳出的实验结论是：
查看习题详情和答案>>
（1）小丽同学为什么要增加一个滑动变阻器？
如果不增加滑动变阻器，你还有其它方法吗？
（2）实验中，小明在闭合开关S后，发现两电表的指针正常偏转，但总是在晃动，无法准确读数，造成此现象的原因可能是
电路中有接触不良的现象
．（3）经重新调整后，利用电压表和电流表测得的实验数据如下表所示，请分析表中实验数据，你认为错误的实验数据是
第五组数据
．请你根据实验数据在坐标系中画出U-I关系图象．| 实验次数 | 1 | 2 | 3 | 4 | 5 | 6 |
| 电压U/V | 2.0 | 2.2 | 2.4 | 2.6 | 2.8 | 3.0 |
| 电流I/A | 0.20 | 0.22 | 0.23 | 0.26 | 1.40 | 0.30 |
在电阻一定时，通过导体的电流与导体两端的电压成正比
．
冬冬在做“探究通过导体的电流与电阻的关系”的实验中，采用了如图所示的电路图．（1）实验过程中，冬冬把电阻R由5Ω换成了10Ω、20Ω，每次闭合开关后，首先应调节
（2）滑动变阻器在本实验中的作用是：①保护电路；②
（3）下表是冬冬测得的三组数据，实验中加在电阻R两端的电压是
| 电阻（Ω） | 5 | 10 | 20 |
| 电流（A） | 1.20 | 0.60 | 0.30 |
①测量物体的长度； ②伏安法测电阻； ③探究重力大小与质量的关系．
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. 查看习题详情和答案>>
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. 查看习题详情和答案>>
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. 查看习题详情和答案>>