题目

把一根7米长的钢筋平均锯成6段，每段占全长的，每段长米，如果锯成两段需2分钟，锯成6段共需分钟。 答案：【1】【2】76【3】10In their efforts to persuade us to buy that product,shopkeepers have made a close study of human nature and have ________ all our little weaknesses. [    ]A. divided  B. arranged C. classified  D. separated