一个数______是3的倍数,这个数就是3的倍数.
一个数各个数位上数的和是3的倍数,这个数就是3的倍数;
故答案为:各个数位上数的和.
Peter received a letter just now his grandma would come to see him.[ ]
A. saying
B. Said
C. to say
D. says
全球水循环的关键是( )。
A.海洋
B.大气
C.陆地
D.森林