Color-blind people often find it difficult to between blue and green.A. compareB. separat

问题补充：

Color-blind people often find it difficult to between blue and green.

A. compare

B. separate

C. distinguish

D. divide

答案：

A. compare

B. separate

(答案→)C. distinguish

D. divide

解析：动词辨析。A比较；B分开，分别；C区别；D把…分成（几个部分）；句意：色盲的人发现要区别蓝色和绿色很困难。根据句意说明C正确。