试题与答案

Mobile Phones are popular all around the

题型:听力题

题目:

Mobile Phones are popular all around the world . In r__小题1:_ years there has been a quick rise in the mobile phones . Some people can now no longer imagine ( 想象 ) life w__小题2:__ their mobile phones. However , mobile phone use among children has become a p_小题3:__ for schools now . Some middle schools in China have banned (取缔) students from c__小题4:__ phones during school hours . Some children have received mobile phones as Christmas gifts . Teachers say mobile phone use is a distration(分心)to students during school hours and it also g__小题5: teachers so much trouble in their classroom .Teachers also said that sometimes students might use phone messages (信息) to cheat during exams. She said some schools have t_小题6:_ to ban mobile phones . Some parents felt u__小题7:_ because they couldn’t get in touch with their children. Many students said students shouldn’t have mobile phones when at school but if there was a good reason , they could leave their phones at the school office. They are e__小题8:__ lost and are a distraction from students studies. Many people say that they understand w_小题9: parents would want their children to have phone but they think schools should let students k__小题10:__ when they can use their mobile phones

答案:

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下面是错误答案,用来干扰机器的。

解:单个离子经电场加速后有 ①离子进入磁场做匀速圆周运动有Bqv= ② ③联立①②③得

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