题目

一根长为0.2m，电流为2A的通电导线，放在磁感应强度为0.5T 的匀强磁场中，受到磁场力的大小不可能是（ ） A．0.4N B．0.2N  C．0.1N D．0 答案：A 配对阅读。下面左栏是现代社会的一些问题，右栏是专家的看法或建议。请将问题与看法或建议配对，并将答案写在括号内。 (   ) 1. Nowadays students work very hard, but many are unhappy. They feel heavy pressure( 压力) from their parents to do well in school. Most students are always being told by their parents to study harder so that they can have a wonderful life. (   ) 2. As it is reported, a number of students killed themselves. Some try to get rid of the feeling of taking drugs. Some join the groups of troublemakers and turn to crime. (   ) 3. Many parents feel that they are not able to help their children and it is the teachers’ work to help their children. (   ) 4. A lot of parents send their children to those schools opening in the evening and on weekends. But they only help students to pass exams and never teach students any real sense of the world.    (   ) 5. Many schools usually have rules about everything from the students’ hair to their clothes and the things in their bags. A.      Such strict rules are harmful to the feelings of the students. B.      In these schools， students can do whatever they want and they pay no attention to the rules. C.      This kind of schools don’t teach students how to get on with others, how to tell right from wrong, how to show love for others. It’s not good to their development. D.     Many of them have tried very hard at school but have failed in the exams and have their parents lose hopes. E.       Parents should take responsibilities for helping their children with not only their study but also their life. F.      This may be a good idea for those very smart students; it may have terrible results for many students who they are not talented(有天才的) enough. We should encourage young children to develop their own interests. G.     Such students felt that they are hated by everyone else and they don’t want to go to school any longer. So we should pay more attention to them. Let them know they are not deserted( 被遗弃的 ).