公元207年，曹操曾写诗明志：“老骥伏枥，志在千里．烈士暮年，壮心不已。”结合所学知识判断，当时曹操“志”在何处（    ）

在图所示的电路中，电源电压为10伏且不变．定值电阻R₁的阻值为10欧，滑动变阻器R₂上标有“2A”字样．闭合电键S

①求通过R₁的电流I₁．

②通电10秒，求电流通过R₁所做的功W₁．

③在电路安全工作的情况下，移动变阻器R₂的滑片，电路消耗的最大功率恰为最小功率的2倍，求变阻器的最大阻值．

阅读理解，判断对错，正确的写“正确”，错误的写“错误”

    My name is Tom. My birthday is June 2nd. The weather is sunny and hot. It's my favourite season. On my birthday, I usually have a birthday party. Sometimes we have a picnic. Tomorrow is my birthday. I am cleaning the room now. My mom is making a birthday cake for me.