题目

如右图，在直角坐标系的I、II象限内有垂直于纸面向里的匀强磁场，第III象限有沿y轴负方向的匀强电场，第四象限内无电场和磁场。质量为m，电量为q的粒子由M点以速度v0沿x轴负方向进入电场，不计粒子的重力，粒子经N和x轴上的P点最后又回到M点。设OM=OP=l，ON=2l，求：        （1）电场强度E的大小        （2）匀强磁场磁感应强度B的大小        （3）粒子从M进入电场，经N、P点最后又回到M点所用的时间。IX. 任务型阅读。If I can give up coffee, anyone can! I was completely addicted (上瘾). I drank coffee all day. I depended on it for everything. Without coffee, I became sad and anxious. I would feel nervous if I couldn’t get some coffee before an important event like giving a speech or taking an exam.It took countless tries before I realized how to give up coffee. Between each try, I learned a little bit more. Here’s how I did it.Coffee Addiction KnowledgeThe first step is to learn about what you are dealing with. Caffeine is a drug. The human body gets addicted to it easily. That’s why you feel good when you get your first cup of coffee in the morning and it’s why you feel bad when you try to give it up. There are emotional addictions to the caffeine as well. Some people believe that with the caffeine you will perform better and have more confidence. Gradually Cut the Amount and Then Replace (替代)It with Green TeaYou can give up coffee suddenly, but why put yourself through that unless you need an unpleasant experience? You can follow these two steps. 1) Gradually cut the amount of coffee you drink according to a plan. Let’s say, you normally drink 5 cups of coffee a day. Over a one-week period, cut out one cup ________ so that by the sixth day you’re at zero.2) On your first day without coffee replace it with green tea. Green tea has the lowest amount of caffeine of most teas, but don’t expect any similar coffee taste.【1】How would the writer feel without coffee before giving it up?________________________________________________________【2】What is caffeine according to the passage?________________________________________________________【3】Put the underlined sentence into Chinese.________________________________________________________【4】Fill in the blank with proper words (no more than 5 words). ________________________________________________________【5】Give a proper title (题目) to the passage. __________________________________