题目

— Could I speak to Mr. Ke?— ________ A . This is not me. B . Don't do it. C . Hold the line, please. D . No, thank you. 答案：C用计算器探究；按一定规律排列的一组数：1，，－，2，，－，……如果从1开始依次连续选取若干个数，使它们的和大于5，那么至少要选________个数．