题干
—Would you like to go shopping with me on Saturday?
— . I have to help my mother with housework.
A：I'm afraid not
B：Take your time
C：Enjoy yourself
D：That's all right
答案(点此获取答案解析）
A
枚最新研制的某型导弹中随机抽取
枚来进行发射试验，用每部分选取的号码间隔一样的系统抽样方法确定所选取的