题目

足球比赛中，运动员射门时，感觉自己的脚有点疼，这是由于物体间力的作用是；守门员飞身将球扑住，说明力能改变物体． 答案：【1】相互【2】运动状态 Had she _________ her promise, she would have made it to Yale University． [　　] A． looked up to B． lived up to C． kept up with D． come up with