题目

下列运算不正确的是 (      )    A、 x2·x3 = x5    B、 (x2)3= x6     C、 x3+x3=2x6    D、 (-2x)3=-8x3 答案：C Bill lives in a very far village. He knows l 【1】 about the outside world.One day, he got a radio f【2】 his uncle who lives in the city. He was very excited and s【3】the radio to all his friends."Great!" all his friends said. Bill felt very proud o 【4】 the radio.However, the radio stopped w【5】 only a few days later. Bill was very sad but didn't know w【6】to do. His friend told h【7】 to go to the town to repair it. So he did. The man in the shop f【8】 two dead cockroaches (蟑螂) in the radio.Bill started crying. The man was surprised, "W【9】 are you crying, my boy?" Bill cried, "Because the two singers died in my radio. How am I going to listen to nice s 【10】 ? "