题目

如图所示，小明用水平推力推静止在水平地面上箱子，但箱子却没有运动，下列说法正确的是（） A . 箱子没有运动，此时箱子水平所受推力小于地面对箱子的摩擦力 B . 箱子受到的重力和地面对箱子的支持力是一对相互作用力 C . 地面对箱子的支持力和箱子对地面的压力时一对平衡力 D . 假设箱子受到的作用力突然全部消失，则箱子将静止在原地阅读对话，选择正确答案。Nancy: How many people are there in your family?Sue: Five. My grandparents, my parents and me. How about your family?Nancy: My family has five people, too.Sue: Oh? Who are they?Nancy: My parents, my brother and me. Oh! And my little puppy. （_____）（_____）A. Nancy’s family B. Sue's family