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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Questions 57 to 61 are based on the following passage. The human criterion for perfect vision is 20/20 for reading the standard lines on a Snellen eye chart without a hitch. The score is determined by...
A.
It can identify small items more quickly than we do.
B.
It can see at a longer distance than we do.
C.
It has more cones in the retina than we do.
D.
h has bigger eyes than we do.
【多选题】视网膜中存在视杆和视锥两种不同感光换能系统的证据有
A.
两类感光细胞分布不同
B.
两类感光细胞所含视色素不同
C.
两类感光细胞换能机制不同
D.
两个系统的会聚程度不同
E.
两个系统的会聚程度相同