Among people who suffer from colour blindness, ______ . [br] When millions of ro

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问题 Among people who suffer from colour blindness, ______ . [br] When millions of rods in oar eyes are at work in darkness we can see ______ .

选项 A、colours only
B、shapes and colours
C、shapes only
D、darkness only

答案 C

解析细节题。“rods”这个专业词汇帮助我们在第三段中间位置迅速定位，在这里，作者告诉我们视杆细胞(rod)在天色接近黑暗时发挥作用，他们能使我们看到物体的外形，而不是颜色。故选C。

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