A:①②④
B:①②④⑥
C:①②
D:①②⑤
Some damage has been caused u____ by people simply walking around the site and some has been caused deliberately.
50枚棋子围成圆圈,编上号码1、2、3、4、…50,每隔一枚棋子取出一枚,要求最后留下的枚棋子的号码是42号,那么该从几号棋子开始取呢?
甲数除以乙数的商是9,余数是3。已知甲数、乙数、商和余数的和是65,甲、乙两数各是多少?