单选题   My little brother practices the speech repeatedly until his delivery and timing were perfect.
 
【正确答案】 A
【答案解析】 题干译文：我弟弟一遍遍地练习演讲，直到他的发言和时间都很完美。划线词的含义是“演讲(传递信息给听众)”，选项B为“手势”，选项C为“节奏”，选项D为“发音”。