【单选题】The average speed of a ball hit by a Pingpang racquet (球拍) is the ______ among all ball games.
【单选题】规定餐次比为早餐占20%,午餐和晚餐各占40%,家庭中的某一成员仅询问到早午两餐,则其人日数为:
【判断题】政府巨灾救助保险是深圳市政府出资向商业保险公司购买,用于巨灾发生时对所有在深人员的人身伤亡救助和核应急救助。
【简答题】A.He runs after the ball. B.He changes positions. C.He throws the ball. D.He tries to hit the ball.