题目

如图所示，一金属圆环用绝缘轻绳悬挂在竖直向下的匀强磁场中，处于水平静止状态，圆环半径为r、电阻为R0。若磁场的磁感应强度大小随时间变化的关系为B=B0+kt（k>0），则（） A . 从上向下看，圆环中产生了逆时针方向的感应电流 B . 圆环中的感应电动势大小为 C . 轻绳对圆环的拉力保持不变 D . 圆环的发热功率逐渐增大 阅读理解 请仔细阅读下面的文章, 根据所提供的信息, 完成下列表格。 Dear Know, 　　I need some advice on how to make friends! I have just moved to a new city．I am 13．I don't know anybody here and I want to make some friends．What's the best way? Where can I meet people? Yours, Tony Dear Tony, 　　There are lots of things you can do．First, you can ride your bike in your neighborhood and try to find some kids．When you find some, you can go up and talk to them．You should also let your parents know that you want to make friends because they can help you．Maybe you can ask your parents to take you to the library or some places where there are lots of kids．You could try joining an art class or a sports club．These are all great ways to meet people．You can try making friends at churches (教堂)too if you go to church on Sundays．Try to be active wherever you are, but just be yourself and don't try so hard．It takes time and patience (耐心)．I hope you will find a best friend soon! Yours, Know 1．________ 2．________ 3．________ 4．________ 5．________