题目

下列说法正确的是（ ） A . 位移、速度、加速度均是矢量 B . 运动是绝对的，所以物体的运动情况与参考系的选择无关 C . 物体位移的大小一定与路程相等 D . 研究月球绕地球运行轨迹时不能把月球看成质点 答案：A用所给单词的适当形式填空。【1】People usually eat________(tradition) food during the Spring Festival.【2】Thousands of________(travel) come to see Yellow Crane Tower，Wuhan every year.【3】We must do something to stop the water________(pollute)．【4】The homework is too much.So it is ________(possible) to finish it in two hours.【5】My grandpa cares more about his________(person) health.He exercises every morning.