问题
选择题
Fill in the blanks. 练一练，写一写。
A. red B. yellow C. blue D. black E. purple
F. orange G. white H. green I. brown J. pink
1. A + D = ( ) 2. A + ( ) = E 3. ( ) + B = F
4. ( ) + ( ) = H 5. A + G = ( )
答案
1. I 2. C 3. A 4. B C 5. J