题目

--- Have you ______ your mother to change her mind? ---No. I talked to her yesterday, but it did not work. A. preferred          B. persuaded        C. promised          D. suggested 答案:B在全民健身环城越野赛中,甲乙两选手的行程y(千米)随时间x(时)变化的图象(全程)如图所示。有下列说法:①起跑后1小时内,甲在乙的前面;②第1小时两人跑了10千米;③甲比乙先到达终点;④两人都跑了20千米。其中正确的说法有____________。(填入正确说法的序号)
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