根据所给的首字母提示，完成短文。
Yesterday I visited the Baihai Zoo．I was s 小题1: to find few people there．Zoos are very important places．They p 小题2: homes for many endangered animals．They also help to educate the public about caring f 小题3: them．If we don’t s 小题4: our zoos, they won’t have e 小题5: money to take care of so many fine animals．Therefore, people should go and visit the zoos m 小题6: often to learn about animals and help to protect them better．
H 小题7: , some people don’t think so．They think zoos are t 小题8: places for animals to live．“I’ve visited a lot of zoos in my life, and I have never seen o 小题9: I liked or one that was suitable for animals to live in．” Jenny said．‘The animals are k 小题10: in small cages and can hardly move at all．What’s more, they are only given food once a week．That’s terrible．”
=2×106m/s垂直进入磁感应强度为B=1T、宽度为L=1m的匀强磁场区域，并从磁场右侧飞出。求：
