如图，电路中电源电压U=6V，三个滑动变阻器R₁、R₂、R₃完全相同．下表列出了电路的两个状态对应的变阻器滑片P₁、P₂、P₃所处的位置．已知电路处于状态“1”时，电流表的读数为0.6A．求：

①R₁的最大电阻值；

②状态“2”时电压表读数为多少；

③状态“2”时三个变阻器电功率的总和是多少．

理发用的电吹风机中有电动机和电热丝，电动机带动风叶转动，电热丝对空气加热，得到热风将头发吹干．设电动机线圈的电阻为R₁，它与电热丝的电阻R₂串联，接到直流电源上．电吹风机两端电压为U，电流为I，消耗的电功率为P，则有（   ）

    If you want to learn a new language, the very first thing to think about is why. Do you need it for a 1 reason, such as your job or your studies? 2 perhaps you're interested in the 3 ,films or music of a different country and you know how much it will help to have a 4 of the language.

    Most people learn best using a variety of 5, but traditional classes are an ideal（理想的）start for many people. They 6 an environment where you can practice under the 7 of someone who's good at the language. We all lead 8 lives and learning a language takes 9. You will have more success if you study regularly, so try to develop a 10. It doesn't matter if you haven't got long. Becoming fluent in a language will take years, but learning to get by takes 11.

    Many people start learning a language and soon give up. “I'm too 12” they say. Yes, children do learn languages more 13 than adults, but research has shown that you can learn a language at any 14. And learning is good for the health of your brain, too. I've also heard people 15 about the mistakes they make when 16. Well, relax and laugh about your mistakes 17 you're much less likely to make them again.

    Learning a new language is never 18. But with some work and devotion, you'll make progress. And you'll be 19 by the positive reaction of some people when you say just a few words in 20 own language. Good luck!

    Good morning！I'm Cindy.This is a1.It's my cup.2color is it？3 yellow and white.And what's this in English？It's4.It's an orange jacket.That's a pen.The pen is5.It's my purple pen.