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【单选题】
视网膜中有一类细胞对光的敏感性低，但能分辨颜色并能分清物体的细节。这类细胞是A、视锥细胞 B、简单细胞 C、复杂细胞D、水平细胞
A.
视锥细胞
B.
简单细胞
C.
复杂细胞
D.
水平细胞
参考答案：
参考解析：
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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.