题目

降落伞在匀速下降过程中遇到水平方向吹来的风，若风速越大，则降落伞A下落的时间不变                B下落的时间越短C落地时速度越小                D落地时速度越大  答案：AD解析:略  They were arguing ___ their parents ___ how to spend the money. A. with; about   B. about; with   C. with; in   D. to; about