如图(a)所示电路中，当闭合开关后，两只电压表的指针偏转均如图(b)所示，则电阻R₁和R₂两端的电压分别为(     )

人的一生中，难免会遭遇困难，经历挫折。下列克服挫折的方法中正确的是（   ）
①积极的心理暗示，调整好心态            ②只靠自己解决，不求别人
③换个角度思考，寻找解决办法            ④努力开拓进取，勇于创新 

单句改错

①Struggled in a world of silence and darkness, Helen Keller seemed to be simple-minded.____

②The three Bronte sisters adopted this practice, Mary Ann Evans did the same.

____

③We decided to fight against this unfair system which prohibits us blacks sitting where we like.____

④Our friendship had developed quickly over the weeks that followed.____

⑤Maybe if I studied science then,I would have been able to give you more help.

____

未成年人的合法权益容易受到非法侵害，这是因为未成年人（   ）