甲、乙两根粗细相同的不同导线，电阻率之比为1：2，长度之比为4：1，那么两根导线加相同的电压时，其电功率之比P_甲：P_乙=______；如果通过两根导线的电流强度相同，则其电功率之比P_甲：P_乙=______．

完型填空二(每空一词) ：

Yesterday was my best friend Li Ming’s birthday. When school was over, I went to the bookshop. I bought a book __28__  ‘Exploring Space’ and had it nicely wrapped for him. __29__ he had wanted to buy this book for weeks, I knew that he would be very pleased with my ___30__.  When I got to the party, LiMing greeted me with a big smile. I noticed that there were piles of presents on the floor, __31__ I was sure that mine would be his favorite. I gave the present to Li Ming and whispered __32__  his ears. ‘You will love it’. He couldn’t wait to unwrap it. ___33__ the smile on his face disappeared and I saw some big red characters on the cover of the book that ___34__ ,‘Caring for your baby’! I __35__ have picked up the wrong book in the shop!