题目

如图所示为闭合电路中两个不同电源的U-I图像，则下列说法中正确的是() A . 电动势E1=E2 ， 短路电流I1>I2 B . 电动势E1=E2 ， 内阻r1>r2 C . 电动势E1>E2 ， 内阻r1>r2 D . 当两电源的工作电流变化量相同时，电源2的路端电压变化较大 答案：A,DOn the first day of school I brought my camera to school. I gave the students a piece of 8 ×11 cardboard(纸板), and asked them to write their names on both sides. As they finished, I asked them to get into groups of three to four students and took photographs of them holding their name cards. After school, I developed the film and printed two sets of photos. That evening, I started to match the names with the faces. I kept one set of pictures at home for about a week so that I could review their names each night. On the second day of school, I put up the other set of photos as a bulletin board (公布栏), with a title such as "Presenting Room 108, ..." The kids loved it! After I had learned all of their names I brought the second set back to school and stuck them onto an 8 ×11 sheet of paper. I placed it in the classroom for other teachers. The cardboard name cards that were made on the first day were collected and put on a shelf. From time to time, they were given back to the students and placed on their desks so that guests or supply teachers (代课老师) could identify all of the students. I’ve been doing this with my grade 7 students for the last nine years and they liked it. It’s fun to bring the photos out again at the end of the school year to see how much they have all changed in ten months.【小题1】The cardboards were used to ______.A．play some kind of game B．decorate the classroomC．identify the students D．print the photos on【小题2】The writer of the passage might be a ______.A．head teacherB．monitorC．photographerD．supply teacher【小题3】Why did the writer leave the second set of the photos at home?A．To memorize the students’ names at home.B．To make cardboard name cards for supply teachers.C．To make a bulletin board in the classroom.D．To match the students’ names with their faces【小题4】Which of the following is TRUE according to the passage?A．The students didn’t have to use the cardboard name cards to identify each other.B．Other teachers couldn’t identify the students without the cardboard name cards. C．The writer kept the cardboard name cards as a souvenir for nine years.D．The guests will know the students’ names by reading the cardboard name cards.【小题5】The passage mainly tells us ______.A．a method of identifying studentsB．a method of decorating classrooms C．the development of photographyD．the importance of cardboard name cards