题目

People’s character _______ greatly from one to another, which accounts for the ______of different behaviors in the same situation, without which behaviors would become uniform and the world would be less colorful.  A. changes; variety;   B. alters; diversity   C. varies; differences   D. varies; diversity 答案：D 质量相等的A、B两物体，从等高处同时开始运动，A做自由落体运动，B做初速度为v0的平抛运动，不计空气阻力，则 （    ）A．两物体在相等时间内发生的位移相等    B．在任何时刻两物体总在同一水平面上C．落地时两物体的速度大小相等   D．在相等的时间间隔内，两物体的速度变化量相等