单选题
He's color-blind and can't ______ between red and green easily.
A. detect B. discover C. distinguish D. determine
【正确答案】
C
【答案解析】[解析] 各选项的意思为：detect“发现；侦查”；discover“发现，碰见”；distinguish“辨别，区分”，distinguish between…and…“区分……和……”；determine“决定”。根据句意可知，答案是C。