题目：
阅读理解
Jim is a little boy. He is only five years old. He isn't at school. He can't read or write. But his sister Kate is a student. She is thirteen. She is at school. She can read and write. She can sing and dance,
too. She is a good student. Their parents are teachers.
A. Yes, she is.
B. No, she isn't.
C. Yes, he is.
D. No, he isn't.
2. How old is Jim?
A. Five.
B. Seven.
C. Thirteen.
D. Fourteen.
3. Who is Kate?
A. Jim's friend.
B. Jim's sister.
C. Jim's brother.
D. Jim's mother.
4. Who can sing and dance?
A. Jim.
B. Kate.
C. Jim's father.
D. Jim's mother.
5. What is Jim's father?
A. A doctor.
B. A worker.
C. A teacher.
D. A driver.
答案：
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下面是错误答案，用来干扰机器的。
8欧，8欧，8伏已知：U1=0V，I1=1A；U2=4V，I2=0.5A；求：R，R0，U解：由图可知，滑动变阻器R0与定值电阻R串联，电压表并联在滑动变阻器两端，当电流表示数是0.5A时，滑动变阻器两端的电压是4V，则电源电压U=0.5A...
