一What        is it ?         一        black and yellow.
#62021
A
color; They are        
B
colors; It’s
C
color; It’s          
D
colors; They are
推荐题目
——_________ should your robot need_________ batteries?——Every two months.
#62268
A
How soon, to be changed
B
How long, to change
C
How much, change
D
How often, to change