— How old is your son? — Five.—We will have a special party for his birthday .
A:five
B:fifth
C:fifteen
D:fifteenth
下列各组词语中,没有错别字的一组是 ( )
组成消化道的消化器官依次是( )
设U=R,A=x|x>0,B=x|x>1,则A∩CUB= ( )