周平王即位，把都城迁到洛邑，以避开犬戎族的进攻。平王时期，周王室势力已经 衰弱，诸侯以强并弱，齐、楚、晋等开始强大起来，政权也由地方诸侯掌握。

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设全集$U=\{x\in z|-1\le x\le 5\},A=\{1,2,5\},B=\{x|-1<x<4\}$，则$B\cap C_{U}A=$（  ）

     Mr. Baker was a strong man. He liked playing football and spent a lot of time on the game when he studied in a medical college. But his right leg was broken when he was playing football with his friends. He couldn't play football any longer. He was sorry for it and still liked to watch the game.

      Now Mr. Baker works in a hospital. He is a good dentist and many patients ask him for help. He is always busy and has little time to watch the matches. He has to watch them on TV at home in the evening. But the biggest football match in their city would start at four one afternoon. Mr. Baker hoped to watch it, but the head of the hospital didn't agree. "You can't go out until all the patients in your office leave. " he said.

     It was three twenty when there were about ten patients in the waiting-room. Mr. Baker was worried. He thought for a moment and had an idea. He said to a woman who was lying on the dental chair,"Cry loudly,Madam! I'll pull your bad tooth out for free if you frighten away the other patients!"

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