题目

As time _____, she became more and more anxious about her son’s safety.    A. passing      B. going by     C. goes by    D. passed 答案：D 解析: 略不考虑空气的作用，踢到空中的足球（　　）A．受到脚的踢力和重力B．只受到重力C．只受到踢力D．不受到任何力