题目

圈出下列各组单词中不同类的单词。(______) 1. A. computer B. clean C. fan(______) 2. A. storybook B. maths book C. toy(______) 3. A. hair B. friendly C. strong(______) 4. A. bathroom B. phone C. bedroom(______) 5. A. vegetable B. beef C. chicken(______) 6. A. doctor B. driver C. people 答案:【答案】1. B 2. C 3. A 4. B. 5. A 6. C 【解析】略若过球面上A、B、C三点的截面与球心的距离恰为球半径的一半,且AB=BC=CA=2,则球体积为 [  ] A.           B. C.            D.
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