One day, many years ago, when I was working as a psychologist in England, I brought David into my office. His face was pale and he looked at his own feet.
David lost his father when he was two years old and lived with his mother and grandfather ever since. But when he was 13, his grandfather died and his mother was killed in a car accident. His teacher told me that he refused to talk to others from then on.
David didn’t say a word. As he was leaving, I put my hand on his shoulder. “Come back next week if you like.” I said.
He came and I suggested we play a game of chess. He agreed. After that we played chess every Wednesday afternoon — in complete silence. Usually, he arrived earlier than we agreed. It seemed that he liked to be with me.
Maybe I gave David something. But I learned more from him. I learned that time makes it possible to get over what seems to be painful. David showed me how to help people like him.
根据短文内容，选择正确答案。
小题1:When David came into the writer’s office, he___________.
A. said hello to the writer B. seemed happy C. looked at his feet
小题2:David’s father died when he was ____________.
A. 13 B. 2 C. 5
小题3:To help David, the writer ________ every Wednesday afternoon.
A. played chess with him B. told stories to him C. played soccer with him
小题4:What club did David join?
A. A chess club B. An art club C. A bicycle club
小题5:Which of the following statements is NOT true?
A. Since his father died, David refused to talk to others.
B. David didn’t say anything to the writer at first.
C. David finally got friends in school.
＝
；此时下板为正，根据右手定则可知，感应电流
的磁场方向向上，则磁感应强度B竖直向上正减弱或者竖直向下正增强；又
，
，电阻R两端电压即为两板间电压 
，联立上述各式解得 
＝
。选项C正确。