题目

Personality is, to large extent, inherent --A-type parents usually bring about A-type offspring. But the environment must also have a profound effect, since if competition is important to the parents, it is likely to become a major factor lives of their children.     One place where children soak up A characteristics is school, which is, by its very nature, a highly competitive institution. Too many schools adopt the win at all costs moral standard and measure their success by sporting achievements. The current passion for making children compete against their classmates or against如图是相向而行的甲、乙两物体的s﹣t图象，下列说法正确的是（　　）A. 相遇时两物体通过的路程均为100mB. 乙的运动速度为3.75m/sC. 0﹣30s内甲做匀速直线运动D. 甲、乙是同时出发的