题目

Those who continuously acquire new knowledge that they can _________ their work are more likely to succeed. A. contribute to                     B. donate to                C. devote to                D. apply to 答案：D 在数1，2，3，4，…，405前分别加“+”或“﹣”，使所得数字之和为非负数，则所得非负数最小为(     ) A．0       B．1       C．2       D．3