Part 1: Self-introduction
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The interlocutor will ask you and your partner questions about yourselves. You may be asked about things like "your hometown" "your interests", "your career plans", etc. Part 2: Presentation
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The interlocutor gives you two photographs and asks you to talk about them for about one minute. The examiner then asks your partner a question about your photographs and your partner responds briefly. Then the interlocutor gives your partner two photographs. Your partner talks about these pictures for about one minute. This time the interlocutor asks you a question about your partner’s photographs and you respond briefly. Part 3: Collaboration
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The interlocutor gives you andyour partner a list of topics. Both of you need to choose one to discuss together: The interlocutor may join in the conversation and ask you questions, but you and your partner are expected to develop the conversation. Topic 1:
What Is the Best Way to Keep Fit
Topic 2:
What Makes a Successful Marriage
Topic 3:
Rising Crime
Topic 4:
Studying English in China or Studying English Abroad
Topic 5:
Qualities of a Good Language Teacher
处固定有质量为m的小球（可视为质点），整个装置处于磁感应强度为B并与导轨平面垂直的匀强磁场中，当ab杆由静止开始紧贴导轨绕a端固定轴向右倒下至水平位置时，球的速度为v。若导轨及金属杆电阻不计，忽略各处的摩擦，重力加速度为g，则在金属杆b端即将脱离导轨MN的瞬间，求：
