题目

完形填空         阅读下面短文，掌握其大意，然后从各题所给的ABCD四个选项中选出最佳选项。Doyou ever watch old movies? Maybe you will see one with Carole Lombard. She wasa famous ___1___ in the 1930s. She died when she was only 34. In her ___2____life she made 70 movies!         Lombard’sreal name was Jane Alice Peters. In 1921, she was playing baseball in the ___3____near her home. A movie director ___4____ her and decided to put her in amovie. She was only 13 at the time. The movie was one of the last silentmovies. She acted(表演) so well tha在下图（a）所示的电路中，电源电压为6伏且保持不变，滑动变阻器R1标有“100Ω 2A”字样。闭合电键S后，电流表A1和A2的示数分别如下图（b）所示。求：（1）电阻R2的阻值。（2）通电10秒钟，电流通过电阻R2所做的功W2。（3）在移动变阻器R1的滑片P时，是否存在使两个电流表指标偏离零刻度的角度恰好相同的情况？如果存在，请求出此时变阻器R1消耗的功率P1；如果不存在，请说明理由。