题目

You must stop _______. My father is sleeping.A. talk B. talking C. to talk D. talks 答案：【答案】B【解析】试题句意：你一定不要说话。我的父亲正要说话。stop to do sth停下来做某事，stop doing sth停止做某事，根据My father is sleeping可知我父亲正在睡觉，故此处用动名词talking，故选B。某商店6月份的利润是2500元，要使8月份的利润达到3600元，则平均每月增长的百分率应该是    ．