12. (A)Using only blue.(B)Using red and blue.(C)Using only red.(D)Using neither red nor blue.

問題詳情

12.
(A)Using only blue.
(B)Using red and blue.
(C)Using only red.
(D)Using neither red nor blue.

答案：B
難度：困難0.294118
統計：A(4),B(5),C(1),D(2),E(0)