Color-blind people often find it difficult to___ between blue and green.
A.separate
B.compare
C.contrast
D.distinguish
拓展
①separate
adj.分开的;单独的;不同的;各自的
v.(使)分离，分开
➢They want to separate teaching from research.
他们要把教学与研究分离开来。
②compare v.比较，对比(with)
My English cannot compare with his.
我的英语不及他。
③contrast v.& n.对比，对照
➢in contrast 与此相反;比较起来
➢by contrast 相比之下;与之相比
➢By contrast, there are some people who actually enjoy work.
相比之下，有一些人是真的喜欢工作。
④distinguish 区分
➢distinguish between A and B 区分A和B
解析
本题答案：D
翻译：色盲的人发现要区别蓝色和绿色很困难。
